668409585904866 has 32 divisors (see below), whose sum is σ = 1439655624086400. Its totient is φ = 205663886786304.

The previous prime is 668409585904859. The next prime is 668409585904937.

668409585904866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14707210 + ... + 39409658.

It is an arithmetic number, because the mean of its divisors is an integer number (44989238252700).

Almost surely, 2^{668409585904866} is an apocalyptic number.

668409585904866 is an abundant number, since it is smaller than the sum of its proper divisors (771246038181534).

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

668409585904866 is a wasteful number, since it uses less digits than its factorization.

668409585904866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25049370.

The product of its (nonzero) digits is 21499084800, while the sum is 84.

The spelling of 668409585904866 in words is "six hundred sixty-eight trillion, four hundred nine billion, five hundred eighty-five million, nine hundred four thousand, eight hundred sixty-six".