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A ZILLION TROUBLES

http://www.worldwidewords.org/articles/numbers.htm

Number word Millions system Thousands system
million 6 6
billion 12 9
trillion 18 12
quadrillion 24 15
quintillion 30 18
sextillion 36 21
septillion 42 24
octillion 48 27
nonillion 54 30
decillion 60 33
undecillion 66 36
duodecillion 72 39
tredecillion 78 42
quattuordecillion 84 45
quindecillion 90 48
sexdecillion 96 51
septemdecillion 102 54
octodecillion 108 57
novemdecillion 114 60

vigintillion

120 63

 

SI prefix Size Derivation
kilo– 3 From the Greek for “thousand” (introduced at the inception of the metric system in 1795 and retained in SI).
mega– 6 From the Greek for “large; great” (also predates SI units, with occasional examples back to 1868).
giga– 9 From the Greek for “giant”.
tera– 12 From the Greek for “monster”.
peta– 15 Seemingly an invented word based on the Greek prefix penta– (this being the fifth prefix in the series).
exa– 18 Apparently derived from the Greek prefix hexa– by deleting the first letter.
zetta– 21 Possibly derived from the Greek word for seven. However, it is also said to be adapted from the Italian sette, “seven”, which seems more likely.
yotta– 24 Similarly either derived from the Greek octa–, or from the Italian otto, “eight”, with the last letter changed to match that of the other prefixes.


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