It is infinity which can't be exactly determined.
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Here is an example: 1.123456789 = one and one hundred twenty-three million, four hundred fifty-six thousand, seven hundred eighty-nine billionths
That would be in the hundred millions. The smallest nine figure (digits) number is 100,000,000 (one hundred million). The largest is 999,999,999 (nine hundred ninety nine million nine hundred ninety nine thousand nine hundred ninety nine; almost a billion)
googleplex.
Seven thousand, nine hundred (or seven thousand and nine hundred).
One hundred quintillion.