668204568 has 48 divisors (see below), whose sum is σ = 1814225400. Its totient is φ = 222180480.

The previous prime is 668204513. The next prime is 668204591. The reversal of 668204568 is 865402866.

668204568 is a `hidden beast` number, since 6 + 6 + 82 + 0 + 4 + 568 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent 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, 18103 + ... + 40793.

Almost surely, 2^668204568 is an apocalyptic number.

It is an amenable number.

668204568 is an abundant number, since it is smaller than the sum of its proper divisors (1146020832).

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

668204568 is a wasteful number, since it uses less digits than its factorization.

668204568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23112 (or 23105 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The square root of 668204568 is about 25849.6531504777. The cubic root of 668204568 is about 874.2516891429.

The spelling of 668204568 in words is "six hundred sixty-eight million, two hundred four thousand, five hundred sixty-eight".