What is the Greatest Common Factor of 15857 and 15861?

Greatest common factor (GCF) of 15857 and 15861 is 1.

GCF(15857,15861) = 1

We will now calculate the prime factors of 15857 and 15861, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15857 and 15861.

How to find the GCF of 15857 and 15861?

We will first find the prime factorization of 15857 and 15861. After we will calculate the factors of 15857 and 15861 and find the biggest common factor number .

Step-1: Prime Factorization of 15857

Prime factors of 15857 are 101, 157. Prime factorization of 15857 in exponential form is:

15857 = 101¹ × 157¹

Step-2: Prime Factorization of 15861

Prime factors of 15861 are 3, 17, 311. Prime factorization of 15861 in exponential form is:

15861 = 3¹ × 17¹ × 311¹

Step-3: Factors of 15857

List of positive integer factors of 15857 that divides 15857 without a remainder.

1, 101, 157

Step-4: Factors of 15861

List of positive integer factors of 15861 that divides 15857 without a remainder.

1, 3, 17, 51, 311, 933, 5287

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15857 and 15861. The biggest common factor number is the GCF number.
So the greatest common factor 15857 and 15861 is 1.

Also check out the Least Common Multiple of 15857 and 15861