What is the Greatest Common Factor of 15557 and 15561?

Greatest common factor (GCF) of 15557 and 15561 is 1.

GCF(15557,15561) = 1

We will now calculate the prime factors of 15557 and 15561, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15557 and 15561.

How to find the GCF of 15557 and 15561?

We will first find the prime factorization of 15557 and 15561. After we will calculate the factors of 15557 and 15561 and find the biggest common factor number .

Step-1: Prime Factorization of 15557

Prime factors of 15557 are 47, 331. Prime factorization of 15557 in exponential form is:

15557 = 47¹ × 331¹

Step-2: Prime Factorization of 15561

Prime factors of 15561 are 3, 7, 13, 19. Prime factorization of 15561 in exponential form is:

15561 = 3² × 7¹ × 13¹ × 19¹

Step-3: Factors of 15557

List of positive integer factors of 15557 that divides 15557 without a remainder.

1, 47, 331

Step-4: Factors of 15561

List of positive integer factors of 15561 that divides 15557 without a remainder.

1, 3, 7, 9, 13, 19, 21, 39, 57, 63, 91, 117, 133, 171, 247, 273, 399, 741, 819, 1197, 1729, 2223, 5187

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15557 and 15561. The biggest common factor number is the GCF number.
So the greatest common factor 15557 and 15561 is 1.

Also check out the Least Common Multiple of 15557 and 15561