What is the Greatest Common Factor of 1643 and 1656?

Greatest common factor (GCF) of 1643 and 1656 is 1.

GCF(1643,1656) = 1

We will now calculate the prime factors of 1643 and 1656, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1643 and 1656.

How to find the GCF of 1643 and 1656?

We will first find the prime factorization of 1643 and 1656. After we will calculate the factors of 1643 and 1656 and find the biggest common factor number .

Step-1: Prime Factorization of 1643

Prime factors of 1643 are 31, 53. Prime factorization of 1643 in exponential form is:

1643 = 31¹ × 53¹

Step-2: Prime Factorization of 1656

Prime factors of 1656 are 2, 3, 23. Prime factorization of 1656 in exponential form is:

1656 = 2³ × 3² × 23¹

Step-3: Factors of 1643

List of positive integer factors of 1643 that divides 1643 without a remainder.

1, 31, 53

Step-4: Factors of 1656

List of positive integer factors of 1656 that divides 1643 without a remainder.

1, 2, 3, 4, 6, 8, 9, 12, 18, 23, 24, 36, 46, 69, 72, 92, 138, 184, 207, 276, 414, 552, 828

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1643 and 1656. The biggest common factor number is the GCF number.
So the greatest common factor 1643 and 1656 is 1.

Also check out the Least Common Multiple of 1643 and 1656