668546856 has 48 divisors (see below), whose sum is σ = 1815933600. Its totient is φ = 222198432.

The previous prime is 668546797. The next prime is 668546873. The reversal of 668546856 is 658645866.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11605 + ... + 38363.

It is an arithmetic number, because the mean of its divisors is an integer number (37831950).

Almost surely, 2^668546856 is an apocalyptic number.

It is an amenable number.

668546856 is an abundant number, since it is smaller than the sum of its proper divisors (1147386744).

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

668546856 is a wasteful number, since it uses less digits than its factorization.

668546856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27118 (or 27111 counting only the distinct ones).

The product of its digits is 8294400, while the sum is 54.

The square root of 668546856 is about 25856.2730493008. The cubic root of 668546856 is about 874.4009422283.

The spelling of 668546856 in words is "six hundred sixty-eight million, five hundred forty-six thousand, eight hundred fifty-six".