668755557866 has 16 divisors (see below), whose sum is σ = 1094340518208. Its totient is φ = 303976120800.

The previous prime is 668755557853. The next prime is 668755557979.

668755557866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 668755557793 and 668755557802.

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, 2637206 + ... + 2879646.

It is an arithmetic number, because the mean of its divisors is an integer number (68396282388).

Almost surely, 2^668755557866 is an apocalyptic number.

668755557866 is a deficient number, since it is larger than the sum of its proper divisors (425584960342).

668755557866 is a wasteful number, since it uses less digits than its factorization.

668755557866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367837.

The product of its digits is 2540160000, while the sum is 74.

The spelling of 668755557866 in words is "six hundred sixty-eight billion, seven hundred fifty-five million, five hundred fifty-seven thousand, eight hundred sixty-six".