664967885972 has 24 divisors (see below), whose sum is σ = 1319167063200. Its totient is φ = 290755188576.

The previous prime is 664967885927. The next prime is 664967885993. The reversal of 664967885972 is 279588769466.

It is a junction number, because it is equal to n+sod(n) for n = 664967885893 and 664967885902.

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 7 ways as a sum of consecutive naturals, for example, 336521222 + ... + 336523197.

It is an arithmetic number, because the mean of its divisors is an integer number (54965294300).

Almost surely, 2^664967885972 is an apocalyptic number.

It is an amenable number.

664967885972 is a deficient number, since it is larger than the sum of its proper divisors (654199177228).

664967885972 is a wasteful number, since it uses less digits than its factorization.

664967885972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673044455 (or 673044453 counting only the distinct ones).

The product of its digits is 2194698240, while the sum is 77.

The spelling of 664967885972 in words is "six hundred sixty-four billion, nine hundred sixty-seven million, eight hundred eighty-five thousand, nine hundred seventy-two".