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.
Since 55105 is a single number, you could say that it shares all of its factors with itself. So the greatest factor of 55105 is 55105
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The GCF is 10.
The Greatest Common Factor (GCF) is: 8
The greatest common factor is 2
The greatest common factor of 30 and 39 is 3.
The greatest common factor (GCF) is: 5.