668404866 has 16 divisors (see below), whose sum is σ = 1338976800. Its totient is φ = 222440448.

The previous prime is 668404843. The next prime is 668404873.

668404866 is nontrivially palindromic in base 10.

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, 86271 + ... + 93698.

It is an arithmetic number, because the mean of its divisors is an integer number (83686050).

Almost surely, 2^668404866 is an apocalyptic number.

668404866 is an abundant number, since it is smaller than the sum of its proper divisors (670571934).

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

668404866 is a wasteful number, since it uses less digits than its factorization.

668404866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180593.

The product of its (nonzero) digits is 1327104, while the sum is 48.

The square root of 668404866 is about 25853.5271481475. The cubic root of 668404866 is about 874.3390343359.

The spelling of 668404866 in words is "six hundred sixty-eight million, four hundred four thousand, eight hundred sixty-six".