Q: What is the digital root of 66,721,551

 A: 6

Why is 6 the digital root of the number 66,721,551?

The digital root of a number is calculated by splitting the digits of a number and then adding them together. You keep splitting and adding the digits until you reach a single positive number.

How do you calculate the digital root of 66,721,551?


Split the number up and add each digit together:


6 + 6 + 7 + 2 + 1 + 5 + 5 + 1 = 33

If the answer is more than one digit, you would add each digit of the answer together again:

3 + 3 = 6

What is the digital root of number 66,721,551?

Answer: 6


More Examples

Number 66,721,54966,721,55066,721,55266,721,553
Digital Root 4578

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