What is the Greatest Common Factor of 665 and 671?

Greatest common factor (GCF) of 665 and 671 is 1.

GCF(665,671) = 1

We will now calculate the prime factors of 665 and 671, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 665 and 671.

How to find the GCF of 665 and 671?

We will first find the prime factorization of 665 and 671. After we will calculate the factors of 665 and 671 and find the biggest common factor number .

Step-1: Prime Factorization of 665

Prime factors of 665 are 5, 7, 19. Prime factorization of 665 in exponential form is:

665 = 5¹ × 7¹ × 19¹

Step-2: Prime Factorization of 671

Prime factors of 671 are 11, 61. Prime factorization of 671 in exponential form is:

671 = 11¹ × 61¹

Step-3: Factors of 665

List of positive integer factors of 665 that divides 665 without a remainder.

1, 5, 7, 19, 35, 95, 133

Step-4: Factors of 671

List of positive integer factors of 671 that divides 665 without a remainder.

1, 11, 61

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 665 and 671. The biggest common factor number is the GCF number.
So the greatest common factor 665 and 671 is 1.

Also check out the Least Common Multiple of 665 and 671