664280756976 has 80 divisors (see below), whose sum is σ = 1806560067200. Its totient is φ = 209751669504.

The previous prime is 664280756831. The next prime is 664280756977. The reversal of 664280756976 is 679657082466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664280756977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10711530 + ... + 10773366.

It is an arithmetic number, because the mean of its divisors is an integer number (22582000840).

Almost surely, 2^664280756976 is an apocalyptic number.

It is an amenable number.

664280756976 is an abundant number, since it is smaller than the sum of its proper divisors (1142279310224).

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

664280756976 is a wasteful number, since it uses less digits than its factorization.

664280756976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73646 (or 73640 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 66.

The spelling of 664280756976 in words is "six hundred sixty-four billion, two hundred eighty million, seven hundred fifty-six thousand, nine hundred seventy-six".