LCM( 66, 23 ) = 1518
The formula for finding LCM is
$$ \text{LCM} (a, b) = \frac{ a \cdot b }{ \text{GCD}(a,b)} $$In this example we have: a = 66, b = 23 and GCD(66, 23) = 1.
$$ \text{LCM} (66, 23) = \frac{ 66 \cdot 23 }{ \text{GCD}(66,23)} = \frac{ 1518 }{ 1 } = 1518 $$