668569965866 has 32 divisors (see below), whose sum is σ = 1142325737280. Its totient is φ = 290674048000.

The previous prime is 668569965857. The next prime is 668569965911.

It is a happy number.

668569965866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4828535 + ... + 4965066.

It is an arithmetic number, because the mean of its divisors is an integer number (35697679290).

Almost surely, 2^668569965866 is an apocalyptic number.

668569965866 is a deficient number, since it is larger than the sum of its proper divisors (473755771414).

668569965866 is a wasteful number, since it uses less digits than its factorization.

668569965866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9793750.

The product of its digits is 6046617600, while the sum is 80.

The spelling of 668569965866 in words is "six hundred sixty-eight billion, five hundred sixty-nine million, nine hundred sixty-five thousand, eight hundred sixty-six".