Q: How Many Digits in the Number 644,655,770?

 A: The number 644,655,770 has 9 digits.

How does 644,655,770 have 9 digits?

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


644655770
Digit # 123456789

What are the number of digits of the numbers near 644,655,770?

644,655,768644,655,769644,655,771644,655,772
9999

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