668518886 has 32 divisors (see below), whose sum is σ = 1196357952. Its totient is φ = 274181760.

The previous prime is 668518871. The next prime is 668518891. The reversal of 668518886 is 688815866.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 21020 + ... + 42176.

It is an arithmetic number, because the mean of its divisors is an integer number (37386186).

Almost surely, 2^668518886 is an apocalyptic number.

668518886 is a deficient number, since it is larger than the sum of its proper divisors (527839066).

668518886 is a wasteful number, since it uses less digits than its factorization.

668518886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21264.

The product of its digits is 4423680, while the sum is 56.

The square root of 668518886 is about 25855.7321690955. The cubic root of 668518886 is about 874.3887479519.

The spelling of 668518886 in words is "six hundred sixty-eight million, five hundred eighteen thousand, eight hundred eighty-six".