The prime factorization of 665 is 5 x 7 x 19. For it to be common, it needs to be compared to another prime factorization.
The prime factorization of 36 is 2 x 2 x 3 x 3. For it to be common, it needs to be compared to the prime factorization of another number.
It is: 7*17 = 119 and needs no exponents
19 is a prime number in its own right and needs no exponents
11 is a prime number in its own right and needs no exponents
That would be -2 (x-2) x (x+3). Click on the Wolfram|Alpha link for all of your polynomial factorization needs.
When asked for a factorization, it is generally understood to mean the prime factorization.
what are the factorization of 36
47 is prime; no factorization.
Factorization of 150 = 2x3x5x5.