668000664 has 48 divisors (see below), whose sum is σ = 1858072320. Its totient is φ = 216648000.

The previous prime is 668000647. The next prime is 668000681. The reversal of 668000664 is 466000866.

It is an interprime number because it is at equal distance from previous prime (668000647) and next prime (668000681).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122712 + ... + 128039.

It is an arithmetic number, because the mean of its divisors is an integer number (38709840).

Almost surely, 2^668000664 is an apocalyptic number.

It is an amenable number.

668000664 is an abundant number, since it is smaller than the sum of its proper divisors (1190071656).

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

668000664 is a wasteful number, since it uses less digits than its factorization.

668000664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250800 (or 250793 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 668000664 is about 25845.7088121026. The cubic root of 668000664 is about 874.1627535282.

The spelling of 668000664 in words is "six hundred sixty-eight million, six hundred sixty-four", and thus it is an aban number.