CSC300: Common numbers [5/9]

Since

  2^(k+j) = 2^k * 2^j

we have:

   2^32 = 2^2 * 2^30 ~  4 billion     (actually              4_294_967_296)  
   2^64 = 2^4 * 2^60 ~ 16 quintillion (actually 18_446_744_073_709_551_616)