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There is not a greatest common factor of a single number, such as 69, because there cannot be a greatest common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common.

The factors of 69 are 1, 3, 23, and 69.

The prime factors of 69 are 3 and 23.

The prime factorization of 69 is 3 x 23.

Examples:

The greatest common factor of 51 and 69 is 3.

The greatest common factor of 32 and 69 is 1.

The greatest common factor of 69 and 115 is 23.

You need at least two numbers to find a GCF. If that's 6 and 9, the GCF is 3.

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Q: What is the greatest common factor of 69?
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