How do you say 100000000000000000 in word form?

Answer 1

That turns out to be a hundred quadrillion.

100,000,000,000,000,000 = 1018.

"One hundred quadrillion" in the US and in Modern British.

Or "one hundred thousand billion" in Continental Europe and Traditional British.

To the first answerer: the questioner did not use commas because WikiAnswers does not permit the use of commas in questions. If you put them in, it will delete them before posting the question.

To the second answerer: you're right, I forgot about the restriction on punctuation in the questions. However, in the absence of commas, you could still leave a space between each group of three numbers, to make them easier to count (admittedly, I counted them anyway).