668593956 has 24 divisors (see below), whose sum is σ = 1613848320. Its totient is φ = 215179552.

The previous prime is 668593931. The next prime is 668593997. The reversal of 668593956 is 659395866.

It is a junction number, because it is equal to n+sod(n) for n = 668593896 and 668593905.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 960276 + ... + 960971.

It is an arithmetic number, because the mean of its divisors is an integer number (67243680).

Almost surely, 2^668593956 is an apocalyptic number.

It is an amenable number.

668593956 is an abundant number, since it is smaller than the sum of its proper divisors (945254364).

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

668593956 is a wasteful number, since it uses less digits than its factorization.

668593956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921283 (or 1921281 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 57.

The square root of 668593956 is about 25857.1838373787. The cubic root of 668593956 is about 874.4214759759.

The spelling of 668593956 in words is "six hundred sixty-eight million, five hundred ninety-three thousand, nine hundred fifty-six".