664801964 has 12 divisors (see below), whose sum is σ = 1174699344. Its totient is φ = 329173584.

The previous prime is 664801937. The next prime is 664801999. The reversal of 664801964 is 469108466.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 806387 + ... + 807210.

It is an arithmetic number, because the mean of its divisors is an integer number (97891612).

Almost surely, 2^664801964 is an apocalyptic number.

It is an amenable number.

664801964 is a deficient number, since it is larger than the sum of its proper divisors (509897380).

664801964 is a wasteful number, since it uses less digits than its factorization.

664801964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613704 (or 1613702 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 664801964 is about 25783.7538771995. The cubic root of 664801964 is about 872.7652202578.

The spelling of 664801964 in words is "six hundred sixty-four million, eight hundred one thousand, nine hundred sixty-four".