668687786866 has 48 divisors (see below), whose sum is σ = 1168174133280. Its totient is φ = 285869936000.

The previous prime is 668687786831. The next prime is 668687786873.

668687786866 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 668687786866.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5913405 + ... + 6025423.

It is an arithmetic number, because the mean of its divisors is an integer number (24336961110).

Almost surely, 2^668687786866 is an apocalyptic number.

668687786866 is a deficient number, since it is larger than the sum of its proper divisors (499486346414).

668687786866 is a wasteful number, since it uses less digits than its factorization.

668687786866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113511 (or 113500 counting only the distinct ones).

The product of its digits is 9364045824, while the sum is 82.

The spelling of 668687786866 in words is "six hundred sixty-eight billion, six hundred eighty-seven million, seven hundred eighty-six thousand, eight hundred sixty-six".