664820574516 has 72 divisors (see below), whose sum is σ = 1928628898560. Its totient is φ = 189153953856.

The previous prime is 664820574503. The next prime is 664820574527. The reversal of 664820574516 is 615475028466.

664820574516 is a `hidden beast` number, since 6 + 6 + 48 + 20 + 574 + 5 + 1 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 5458971 + ... + 5579426.

It is an arithmetic number, because the mean of its divisors is an integer number (26786512480).

Almost surely, 2^664820574516 is an apocalyptic number.

It is an amenable number.

664820574516 is an abundant number, since it is smaller than the sum of its proper divisors (1263808324044).

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

664820574516 is a wasteful number, since it uses less digits than its factorization.

664820574516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11038653 (or 11038648 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 664820574516 in words is "six hundred sixty-four billion, eight hundred twenty million, five hundred seventy-four thousand, five hundred sixteen".