668984489866 has 64 divisors (see below), whose sum is σ = 1257657375744. Its totient is φ = 259275945600.

The previous prime is 668984489857. The next prime is 668984489879.

668984489866 is nontrivially palindromic in base 10.

668984489866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 668984489866.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85032865 + ... + 85040731.

It is an arithmetic number, because the mean of its divisors is an integer number (19650896496).

Almost surely, 2^668984489866 is an apocalyptic number.

668984489866 is a deficient number, since it is larger than the sum of its proper divisors (588672885878).

668984489866 is a wasteful number, since it uses less digits than its factorization.

668984489866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10715.

The product of its digits is 6879707136, while the sum is 82.

The spelling of 668984489866 in words is "six hundred sixty-eight billion, nine hundred eighty-four million, four hundred eighty-nine thousand, eight hundred sixty-six".