668696956 has 24 divisors (see below), whose sum is σ = 1201356464. Its totient is φ = 325503360.

The previous prime is 668696953. The next prime is 668696971. The reversal of 668696956 is 659696866.

It is a junction number, because it is equal to n+sod(n) for n = 668696894 and 668696903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668696953) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 47626 + ... + 60046.

Almost surely, 2^668696956 is an apocalyptic number.

It is an amenable number.

668696956 is a deficient number, since it is larger than the sum of its proper divisors (532659508).

668696956 is a wasteful number, since it uses less digits than its factorization.

668696956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12781 (or 12779 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 61.

The square root of 668696956 is about 25859.1754702272. The cubic root of 668696956 is about 874.4663765650.

The spelling of 668696956 in words is "six hundred sixty-eight million, six hundred ninety-six thousand, nine hundred fifty-six".