n =103n =Americanname EuropeannameSI prefixGreek-basedname(proposed)

3109billionmilliardgiga-gillion

41012trillionbilliontera-tetrillion

51015quadrillionbilliardpeta-pentillion

61018quintilliontrillionexa-hexillion

71021sextilliontrilliardzetta-heptillion

81024septillionquadrillionyotta-oktillion

91027octillionquadrilliardennillion

101030nonillionquintilliondekillion

111033decillionquintilliardhendekillion

121036undecillionsextilliondodekillion

131039duodecillionsextilliardtrisdekillion

141042tredecillionseptilliontetradekillion

151045quattuordecillionseptilliardpentadekillion

161048quindecillionoctillionhexadekillion

171051sexdecillionoctilliardheptadekillion

181054septendecillionnonillionoktadekillion

191057octodecillionnonilliardenneadekillion

201060novemdecilliondecillionicosillion

211063vigintilliondecilliardicosihenillion

221066unvigintillionundecillionicosidillion

231069duovigintillionundecilliardicositrillion

241072trevigintillionduodecillionicositetrillion

251075quattuorvigintillionduodecilliardicosipentillion

261078quinvigintilliontredecillionicosihexillion

271081sexvigintilliontredecilliardicosiheptillion

281084septenvigintillionquattuordecillionicosioktillion

291087octovigintillionquattuordecilliardicosiennillion

301090novemvigintillionquindecilliontriacontillion

311093trigintillionquindecilliardtriacontahenillion

321096untrigintillionsexdecilliontriacontadillion

331099duotrigintillionsexdecilliardtriacontatrillion

This process can be continued indefinitely, but one has to stop somewhere. The name centillion (n = 100) has appeared in many dictionaries. A centillion is 10303 (1 followed by 303 zeroes) in the American system and a whopping 10600 (1 followed by 600 zeroes) in the European system.Finally, there is the googol, the number 10100 (1 followed by 100 zeroes). Invented more for fun than for use, the googol lies outside the regular naming systems. The googol equals 10 duotrigintillion in the American system, 10 sexdecilliard in the European system, and 10 triacontatrillion in the proposed Greek-based system.The googolplex (1 followed by a googol of zeroes) is far larger than any of the numbers discussed here.Short scaleLong scalePower

ValueAmericanBritish(Nicolas Chuquet)Continental European(Jacques Peletier du Mans)of a thousandof a million

100One10001+110000000

101Ten

102Hundred

103Thousand10000+110000000.5

106Million10001+110000001

109BillionThousand millionMilliard10002+110000001.5

1012TrillionBillion10003+110000002

1015QuadrillionThousand billionBilliard10004+110000002.5

1018QuintillionTrillion10005+110000003

1021SextillionThousand trillionTrilliard10006+110000003.5

1024SeptillionQuadrillion10007+110000004

1027OctillionThousand quadrillionQuadrilliard10008+110000004.5

1030NonillionQuintillion10009+110000005

1033DecillionThousand quintillionQuintilliard100010+110000005.5

1036UndecillionSextillion100011+110000006

1039DuodecillionThousand sextillionSextilliard100012+110000006.5

1042TredecillionSeptillion100013+110000007

1045QuattuordecillionThousand septillionSeptilliard100014+110000007.5

1048QuindecillionOctillion100015+110000008

1051SexdecillionThousand octillionOctilliard100016+110000008.5

1054SeptendecillionNonillion100017+110000009

1057OctodecillionThousand nonillionNonilliard100018+110000009.5

1060NovemdecillionDecillion100019+1100000010

1063VigintillionThousand decillionDecilliard100020+1100000010.5

1066UnvigintillionUndecillion100021+1100000011

1069DuovigintillionThousand undecillionUndecilliard100022+1100000011.5

1072TrevigintillionDuodecillion100023+1100000012

1075QuattuorvigintillionThousand duodecillionDuodecilliard100024+1100000012.5

1078QuinvigintillionTredecillion100025+1100000013

...............

1093TrigintillionThousand quindecillionQuindecilliard100030+1100000015.5

...............

10120NovemtrigintillionVigintillion100039+1100000020

10123QuadragintillionThousand vigintillionVigintilliard100040+1100000020.5

...............

10153QuinquagintillionThousand quinvigintillionQuinvigintilliard100050+1100000025.5

...............

10180NovemquinquagintillionTrigintillion100059+1100000030

10183SexagintillionThousand trigintillionTrigintilliard100060+1100000030.5

...............

10213SeptuagintillionThousand quintrigintillionQuintrigintilliard100070+1100000035.5

...............

10240NovemseptuagintillionQuadragintillion100079+1100000040

10243OctogintillionThousand quadragintillionQuadragintilliard100080+1100000040.5

...............

10273NonagintillionThousand quinquadragintillionQuinquadragintilliard100090+1100000045.5

...............

10300NovemnonagintillionQuinquagintillion100099+1100000050

10303CentillionThousand quinquagintillionQuinquagintilliard1000100+1100000050.5

............

10360Sexagintillion1000119+1100000060

10420Septuagintillion1000139+1100000070

10480Octogintillion1000159+1100000080

10540Nonagintillion1000179+1100000090

10600Centillion1000199+11000000100

10603DucentillionThousand centillionCentilliard1000200+11000000100.5

Myriad systemProposed by Donald E. Knuth:ValueNameNotation

100One1

101Ten10

102Hundred100

103Ten hundred1000

104Myriad1,0000

105Ten myriad10,0000

106Hundred myriad100,0000

107Ten hundred myriad1000,0000

108Myllion1;0000,0000

1012Myriad myllion1,0000;0000,0000

1016Byllion1:0000,0000;0000,0000

1024Myllion byllion1;0000,0000:0000,0000;0000,0000

1032Tryllion1'0000,0000;0000,0000:0000,0000;0000,0000

1064Quadryllion1'0000,0000;0000,0000:0000,0000;0000,0000'0000,0000;0000,0000:0000,0000;0000,0000

10128Quintyllion

10256Sextyllion

10512Septyllion

101024Octyllion

102048Nonyllion

104096Decyllion

108192Undecyllion

1016,384Duodecyllion

1032,768Tredecyllion

1065,536Quattuordecyllion

10131,072Quindecyllion

10262,144Sexdecyllion

10524,288Septendecyllion

101,048,576Octodecyllion

102,097,152Novemdecyllion

Vigintyllion

Trigintyllion

Quadragintyllion

Quinquagintyllion

Sexagintyllion

Septuagintyllion

Octogintyllion

Nonagintyllion

Centyllion

Millyllion

Myryllion