What is the Greatest Common Factor of 655 and 663?

Greatest common factor (GCF) of 655 and 663 is 1.

GCF(655,663) = 1

We will now calculate the prime factors of 655 and 663, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 655 and 663.

How to find the GCF of 655 and 663?

We will first find the prime factorization of 655 and 663. After we will calculate the factors of 655 and 663 and find the biggest common factor number .

Step-1: Prime Factorization of 655

Prime factors of 655 are 5, 131. Prime factorization of 655 in exponential form is:

655 = 5¹ × 131¹

Step-2: Prime Factorization of 663

Prime factors of 663 are 3, 13, 17. Prime factorization of 663 in exponential form is:

663 = 3¹ × 13¹ × 17¹

Step-3: Factors of 655

List of positive integer factors of 655 that divides 655 without a remainder.

1, 5, 131

Step-4: Factors of 663

List of positive integer factors of 663 that divides 655 without a remainder.

1, 3, 13, 17, 39, 51, 221

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 655 and 663. The biggest common factor number is the GCF number.
So the greatest common factor 655 and 663 is 1.

Also check out the Least Common Multiple of 655 and 663