What is the Greatest Common Factor of 15861 and 15865?

Greatest common factor (GCF) of 15861 and 15865 is 1.

GCF(15861,15865) = 1

We will now calculate the prime factors of 15861 and 15865, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 15861 and 15865.

How to find the GCF of 15861 and 15865?

We will first find the prime factorization of 15861 and 15865. After we will calculate the factors of 15861 and 15865 and find the biggest common factor number .

Step-1: 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-2: Prime Factorization of 15865

Prime factors of 15865 are 5, 19, 167. Prime factorization of 15865 in exponential form is:

15865 = 5¹ × 19¹ × 167¹

Step-3: Factors of 15861

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

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

Step-4: Factors of 15865

List of positive integer factors of 15865 that divides 15861 without a remainder.

1, 5, 19, 95, 167, 835, 3173

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 15861 and 15865. The biggest common factor number is the GCF number.
So the greatest common factor 15861 and 15865 is 1.

Also check out the Least Common Multiple of 15861 and 15865