668206804 has 12 divisors (see below), whose sum is σ = 1169598528. Its totient is φ = 334035800.

The previous prime is 668206757. The next prime is 668206813. The reversal of 668206804 is 408602866.

It is a congruent number.

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, 10149 + ... + 37939.

It is an arithmetic number, because the mean of its divisors is an integer number (97466544).

Almost surely, 2^668206804 is an apocalyptic number.

It is an amenable number.

668206804 is a deficient number, since it is larger than the sum of its proper divisors (501391724).

668206804 is a wasteful number, since it uses less digits than its factorization.

668206804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33806 (or 33804 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 668206804 is about 25849.6964005382. The cubic root of 668206804 is about 874.2526643056.

The spelling of 668206804 in words is "six hundred sixty-eight million, two hundred six thousand, eight hundred four".