The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
The greatest common factor of 66 and 78 is 6.
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The GCF is 6.
The GCF is 6.
The GCF is 6.
The GCF is 6.
If you mean 78 and 10104 then the GCF is 6