666508 has 6 divisors (see below), whose sum is σ = 1166396. Its totient is φ = 333252.

The previous prime is 666493. The next prime is 666511. The reversal of 666508 is 805666.

It is a self number, because there is not a number n which added to its sum of digits gives 666508.

It is an unprimeable number.

666508 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83310 + ... + 83317.

2⁶⁶⁶⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

666508 is a deficient number, since it is larger than the sum of its proper divisors (499888).

666508 is a wasteful number, since it uses less digits than its factorization.

666508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166631 (or 166629 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 666508 is about 816.3994120527. The cubic root of 666508 is about 87.3511155187.

The spelling of 666508 in words is "six hundred sixty-six thousand, five hundred eight".