A single number cannot have a greatest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.
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The greatest common factor of 66 and 96 is 6.
The greatest common factor of 12 66 and 84 is 6.
The Greatest Common Factor (GCF) is: 6
greatest common factor of 66 90 and 150 is 6.
The GCF is 66.