Q: How Many Digits in the Number 643,521,409?

 A: The number 643,521,409 has 9 digits.

How does 643,521,409 have 9 digits?

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


643521409
Digit # 123456789

What are the number of digits of the numbers near 643,521,409?

643,521,407643,521,408643,521,410643,521,411
9999

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