Q: How Many Digits in the Number 666,721,817?

 A: The number 666,721,817 has 9 digits.

How does 666,721,817 have 9 digits?

You simply count the number of digits from the first number to the last. Like this:


666721817
Digit # 123456789

What are the number of digits of the numbers near 666,721,817?

666,721,815666,721,816666,721,818666,721,819
9999

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