668614808 has 8 divisors (see below), whose sum is σ = 1253652780. Its totient is φ = 334307400.

The previous prime is 668614781. The next prime is 668614861. The reversal of 668614808 is 808416866.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×668614808² = 894091522953753728, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41788418 + ... + 41788433.

Almost surely, 2^668614808 is an apocalyptic number.

It is an amenable number.

668614808 is a deficient number, since it is larger than the sum of its proper divisors (585037972).

668614808 is a wasteful number, since it uses less digits than its factorization.

668614808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83576857 (or 83576853 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 668614808 is about 25857.5870490655. The cubic root of 668614808 is about 874.4305663199.

The spelling of 668614808 in words is "six hundred sixty-eight million, six hundred fourteen thousand, eight hundred eight".