What is the Greatest Common Factor of 12345 and 12355?

Greatest common factor (GCF) of 12345 and 12355 is 5.

GCF(12345,12355) = 5

We will now calculate the prime factors of 12345 and 12355, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 12345 and 12355.

How to find the GCF of 12345 and 12355?

We will first find the prime factorization of 12345 and 12355. After we will calculate the factors of 12345 and 12355 and find the biggest common factor number .

Step-1: Prime Factorization of 12345

Prime factors of 12345 are 3, 5, 823. Prime factorization of 12345 in exponential form is:

12345 = 3¹ × 5¹ × 823¹

Step-2: Prime Factorization of 12355

Prime factors of 12355 are 5, 7, 353. Prime factorization of 12355 in exponential form is:

12355 = 5¹ × 7¹ × 353¹

Step-3: Factors of 12345

List of positive integer factors of 12345 that divides 12345 without a remainder.

1, 3, 5, 15, 823, 2469, 4115

Step-4: Factors of 12355

List of positive integer factors of 12355 that divides 12345 without a remainder.

1, 5, 7, 35, 353, 1765, 2471

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 12345 and 12355. The biggest common factor number is the GCF number.
So the greatest common factor 12345 and 12355 is 5.

Also check out the Least Common Multiple of 12345 and 12355