What is the Greatest Common Factor of 661 and 672?

Greatest common factor (GCF) of 661 and 672 is 1.

GCF(661,672) = 1

We will now calculate the prime factors of 661 and 672, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 661 and 672.

How to find the GCF of 661 and 672?

We will first find the prime factorization of 661 and 672. After we will calculate the factors of 661 and 672 and find the biggest common factor number .

Step-1: Prime Factorization of 661

Prime factors of 661 are 661. Prime factorization of 661 in exponential form is:

661 = 661¹

Step-2: Prime Factorization of 672

Prime factors of 672 are 2, 3, 7. Prime factorization of 672 in exponential form is:

672 = 2⁵ × 3¹ × 7¹

Step-3: Factors of 661

List of positive integer factors of 661 that divides 661 without a remainder.

Step-4: Factors of 672

List of positive integer factors of 672 that divides 661 without a remainder.

1, 2, 3, 4, 6, 7, 8, 12, 14, 16, 21, 24, 28, 32, 42, 48, 56, 84, 96, 112, 168, 224, 336

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 661 and 672. The biggest common factor number is the GCF number.
So the greatest common factor 661 and 672 is 1.

Also check out the Least Common Multiple of 661 and 672