1,000,000,000,000,000,000=1 quintillion
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The number 10000000000000000000 is written in words as "ten quintillion."
The answer is quintillion. Before quintillion in quadrillion then trillion. After quintillion is sextillion then septillion and so on.
It is written as: one sextillion two hundred fifty quintillion.
Since a quintillion has 18 zeros; one quintillion would look like this: 1,000,000,000,000,000,000
Hundred quintillion one.