Exa

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Exa (symbol E) is an SI prefix indicating a factor of 1018 (one trillion).

Adopted in 1975, it comes from the Greek έξα («éxa») which means six (like «hexa-»), since it is equivalent to 10006.

In computing, exa can mean 260, instead of 1,000,000,000,000,000,000, especially when used as a byte (exabyte) prefix.

1000n10nPrefix Symbol Short scale Long scale Decimal equity in the prefixes of the International System Allocation
1000101030quetta- Q Nonillion Quintillón 1 000 000 000 000 000 000 000 000 2022
100091027ronna- R Eighth Mil cuatrillones 1 000 000 000 000 000 000 000 000 2022
100081024Yotta- And Septillion Cuatrillón 1 000 000 000 000 000 000 000 1991
100071021zetta- Z Sextillion A thousand trillions 1 000 000 000 000 000 000 1991
100061018exa... E Quintillón Trillion 1 000 000 000 000 000 000 1975
100051015peta... P Cuatrillón A billion. 1 000 000 000 000 000 1975
100041012tera- T Trillion Billion 1 000 000 000 000 1960
10003109giga- G Billion billion / billion 1 000 000 000 1960
10002106mega- M Million 1 000 1960
10001103kilo- k Mil / Millar 1 000 1795
10002/3102Hecto- h Hundred / Hundred 100 1795
10001/3101deca- da Ten / Ten 10 1795
10000100No prefixOne / Unit 1
1000−1/310−1deci- d Tenth 0.1 1795
1000−2/310−2centi- c Centésimo 0.01 1795
1000−110−3mili- m A thousandth 0.001 1795
1000−210−6micro- μ Millions 0.000 001 1960
1000−310−9nano- n Billionth One billion dollars 0.000 000 001 1960
1000−410−12peak... p Trillonéimo Billionth 0.000 000 000 001 1960
1000−510−15femto- f Cuatrillonésimo Milbillonésimo 0.000 000 000 000 001 1964
1000−610−18Atto- a Quintillonésimo Trillonéimo 0.000 000 000 000 000 000 001 1964
1000−710−21zepto- z Sextillonésimo Miltrillonésimo 0.000 000 000 000 000 000 000 001 1991
1000−810−24Icto- and Septillonésimo Cuatrillonésimo 0.000 000 000 000 000 000 000 000 000 001 1991
1000−910−27red. r Eighth. Milcuatrillonésimo 0.000 000 000 000 000 000 000 000 000 000 001 2022
1000−1010−30Quecto- q Nonillonésimo Quintillonésimo 0.000 000 000 000 000 000 000 000 000 000 000 001 2022