66664572324944 has 80 divisors (see below), whose sum is σ = 143172770802624. Its totient is φ = 29817994752000.

The previous prime is 66664572324941. The next prime is 66664572324953. The reversal of 66664572324944 is 44942327546666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664572324941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8606369 + ... + 14401344.

Almost surely, 2^{66664572324944} is an apocalyptic number.

It is an amenable number.

66664572324944 is an abundant number, since it is smaller than the sum of its proper divisors (76508198477680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66664572324944 is a wasteful number, since it uses less digits than its factorization.

66664572324944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23007996 (or 23007990 counting only the distinct ones).

The product of its digits is 1254113280, while the sum is 68.

The spelling of 66664572324944 in words is "sixty-six trillion, six hundred sixty-four billion, five hundred seventy-two million, three hundred twenty-four thousand, nine hundred forty-four".