668690696 has 16 divisors (see below), whose sum is σ = 1257805500. Its totient is φ = 333275904.

The previous prime is 668690683. The next prime is 668690717. The reversal of 668690696 is 696096866.

668690696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 652802500 + 15888196 = 25550^2 + 3986^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131021 + ... + 136028.

Almost surely, 2^668690696 is an apocalyptic number.

It is an amenable number.

668690696 is a deficient number, since it is larger than the sum of its proper divisors (589114804).

668690696 is a wasteful number, since it uses less digits than its factorization.

668690696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267368 (or 267364 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 56.

The square root of 668690696 is about 25859.0544297351. The cubic root of 668690696 is about 874.4636477870.

The spelling of 668690696 in words is "six hundred sixty-eight million, six hundred ninety thousand, six hundred ninety-six".