What is the Greatest Common Factor of 663 and 680?

Greatest common factor (GCF) of 663 and 680 is 17.

GCF(663,680) = 17

We will now calculate the prime factors of 663 and 680, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 663 and 680.

How to find the GCF of 663 and 680?

We will first find the prime factorization of 663 and 680. After we will calculate the factors of 663 and 680 and find the biggest common factor number .

Step-1: 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-2: Prime Factorization of 680

Prime factors of 680 are 2, 5, 17. Prime factorization of 680 in exponential form is:

680 = 2³ × 5¹ × 17¹

Step-3: Factors of 663

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

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

Step-4: Factors of 680

List of positive integer factors of 680 that divides 663 without a remainder.

1, 2, 4, 5, 8, 10, 17, 20, 34, 40, 68, 85, 136, 170, 340

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 663 and 680. The biggest common factor number is the GCF number.
So the greatest common factor 663 and 680 is 17.

Also check out the Least Common Multiple of 663 and 680