What is the Greatest Common Factor of 639 and 653?

Greatest common factor (GCF) of 639 and 653 is 1.

GCF(639,653) = 1

We will now calculate the prime factors of 639 and 653, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 639 and 653.

How to find the GCF of 639 and 653?

We will first find the prime factorization of 639 and 653. After we will calculate the factors of 639 and 653 and find the biggest common factor number .

Step-1: Prime Factorization of 639

Prime factors of 639 are 3, 71. Prime factorization of 639 in exponential form is:

639 = 3² × 71¹

Step-2: Prime Factorization of 653

Prime factors of 653 are 653. Prime factorization of 653 in exponential form is:

653 = 653¹

Step-3: Factors of 639

List of positive integer factors of 639 that divides 639 without a remainder.

1, 3, 9, 71, 213

Step-4: Factors of 653

List of positive integer factors of 653 that divides 639 without a remainder.

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 639 and 653. The biggest common factor number is the GCF number.
So the greatest common factor 639 and 653 is 1.

Also check out the Least Common Multiple of 639 and 653