What is the Least Common Multiple of 1643 and 1661?

Least common multiple or lowest common denominator (lcd) can be calculated in two way; with the LCM formula calculation of greatest common factor (GCF), or multiplying the prime factors with the highest exponent factor.

Least Common Multiple of 1643 and 1661 with GCF Formula

The formula of LCM is LCM(a,b) = ( a × b) / GCF(a,b).
We need to calculate greatest common factor 1643 and 1661, than apply into the LCM equation.

GCF(1643,1661) = 1
LCM(1643,1661) = ( 1643 × 1661) / 1
LCM(1643,1661) = 2729023 / 1
LCM(1643,1661) = 2729023

Least Common Multiple (LCM) of 1643 and 1661 with Primes

Least common multiple can be found by multiplying the highest exponent prime factors of 1643 and 1661. First we will calculate the prime factors of 1643 and 1661.

Prime Factorization of 1643

Prime Factorization of 1661

Now multiplying the highest exponent prime factors to calculate the LCM of 1643 and 1661.

LCM(1643,1661) = 31¹ × 53¹ × 11¹ × 151¹
LCM(1643,1661) = 2729023