664660868 has 12 divisors (see below), whose sum is σ = 1163401680. Its totient is φ = 332260392.

The previous prime is 664660817. The next prime is 664660873. The reversal of 664660868 is 868066466.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

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, 7955 + ... + 37317.

It is an arithmetic number, because the mean of its divisors is an integer number (96950140).

Almost surely, 2^664660868 is an apocalyptic number.

It is an amenable number.

664660868 is a deficient number, since it is larger than the sum of its proper divisors (498740812).

664660868 is a wasteful number, since it uses less digits than its factorization.

664660868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35026 (or 35024 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 50.

The square root of 664660868 is about 25781.0175904676. The cubic root of 664660868 is about 872.7034713456.

The spelling of 664660868 in words is "six hundred sixty-four million, six hundred sixty thousand, eight hundred sixty-eight".