factors: 1, 3, 59, 177
prime factors: 3, 59
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There can be no Greatest Common Factor of a single number - you need another number to compare it to.
The prime factorization of 77 = 7 x 11The prime factorization of 15 = 3 x 5
53 is a prime number so there is no relevant prime factorization for it.
prime factorization
the prime factorization
A factor free is a diagram showing the prime factorization of a number.