What is the Greatest Common Factor of 1661 and 1681?

Greatest common factor (GCF) of 1661 and 1681 is 1.

GCF(1661,1681) = 1

We will now calculate the prime factors of 1661 and 1681, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 1661 and 1681.

How to find the GCF of 1661 and 1681?

We will first find the prime factorization of 1661 and 1681. After we will calculate the factors of 1661 and 1681 and find the biggest common factor number .

Step-1: Prime Factorization of 1661

Prime factors of 1661 are 11, 151. Prime factorization of 1661 in exponential form is:

1661 = 11¹ × 151¹

Step-2: Prime Factorization of 1681

Prime factors of 1681 are 41. Prime factorization of 1681 in exponential form is:

1681 = 41²

Step-3: Factors of 1661

List of positive integer factors of 1661 that divides 1661 without a remainder.

1, 11, 151

Step-4: Factors of 1681

List of positive integer factors of 1681 that divides 1661 without a remainder.

1, 41

Final Step: Biggest Common Factor Number

We found the factors and prime factorization of 1661 and 1681. The biggest common factor number is the GCF number.
So the greatest common factor 1661 and 1681 is 1.

Also check out the Least Common Multiple of 1661 and 1681