What is the Greatest Common Factor of 1611 and 1620?

Greatest common factor (GCF) of 1611 and 1620 is 9.

GCF(1611,1620) = 9

We will now calculate the prime factors of 1611 and 1620, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1611 and 1620.

How to find the GCF of 1611 and 1620?

We will first find the prime factorization of 1611 and 1620. After we will calculate the factors of 1611 and 1620 and find the biggest common factor number .

Step-1: Prime Factorization of 1611

Prime factors of 1611 are 3, 179. Prime factorization of 1611 in exponential form is:

1611 = 3² × 179¹

Step-2: Prime Factorization of 1620

Prime factors of 1620 are 2, 3, 5. Prime factorization of 1620 in exponential form is:

1620 = 2² × 3⁴ × 5¹

Step-3: Factors of 1611

List of positive integer factors of 1611 that divides 1611 without a remainder.

1, 3, 9, 179, 537

Step-4: Factors of 1620

List of positive integer factors of 1620 that divides 1611 without a remainder.

1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 270, 324, 405, 540, 810

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1611 and 1620. The biggest common factor number is the GCF number.
So the greatest common factor 1611 and 1620 is 9.

Also check out the Least Common Multiple of 1611 and 1620