It is: one hundred quadrillion one.
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That number in word form is: one hundred quintillion.
I comes from numero, the ablative form of the Latin word numerus.
The ordinal number is 18th or eighteenth. The word form is eighteen.
The number 50,000 in word form is "fifty thousand."
The number 7,000,000,000,000,000,000,000,000,000 in word form is seven septillion.