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There is not a greatest common factor of 81 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 81 are 1, 3, 9, 27, and 81.

The prime factors of 81 are 3, 3, 3, and 3.

Examples:

The greatest common factor of 54 and 81 is 27.

The greatest common factor of 81 and 117 is 9.

You need at least two numbers to find a GCF.

You need at least two numbers to find a GCF.

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Q: What is the greatest common factor of 81?

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