What is the Greatest Common Factor of 1640 and 1655?

Greatest common factor (GCF) of 1640 and 1655 is 5.

GCF(1640,1655) = 5

We will now calculate the prime factors of 1640 and 1655, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1640 and 1655.

How to find the GCF of 1640 and 1655?

We will first find the prime factorization of 1640 and 1655. After we will calculate the factors of 1640 and 1655 and find the biggest common factor number .

Step-1: Prime Factorization of 1640

Prime factors of 1640 are 2, 5, 41. Prime factorization of 1640 in exponential form is:

1640 = 2³ × 5¹ × 41¹

Step-2: Prime Factorization of 1655

Prime factors of 1655 are 5, 331. Prime factorization of 1655 in exponential form is:

1655 = 5¹ × 331¹

Step-3: Factors of 1640

List of positive integer factors of 1640 that divides 1640 without a remainder.

1, 2, 4, 5, 8, 10, 20, 40, 41, 82, 164, 205, 328, 410, 820

Step-4: Factors of 1655

List of positive integer factors of 1655 that divides 1640 without a remainder.

1, 5, 331

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1640 and 1655. The biggest common factor number is the GCF number.
So the greatest common factor 1640 and 1655 is 5.

Also check out the Least Common Multiple of 1640 and 1655