66577800920 has 16 divisors (see below), whose sum is σ = 149800052160. Its totient is φ = 26631120352.

The previous prime is 66577800911. The next prime is 66577800941. The reversal of 66577800920 is 2900877566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832222472 + ... + 832222551.

It is an arithmetic number, because the mean of its divisors is an integer number (9362503260).

Almost surely, 2^66577800920 is an apocalyptic number.

It is an amenable number.

66577800920 is an abundant number, since it is smaller than the sum of its proper divisors (83222251240).

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

66577800920 is a wasteful number, since it uses less digits than its factorization.

66577800920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664445034 (or 1664445030 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 66577800920 in words is "sixty-six billion, five hundred seventy-seven million, eight hundred thousand, nine hundred twenty".