668159951866 has 16 divisors (see below), whose sum is σ = 1106525575008. Its totient is φ = 300049922800.

The previous prime is 668159951857. The next prime is 668159951891.

668159951866 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 668159951795 and 668159951804.

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, 182955445 + ... + 182959096.

It is an arithmetic number, because the mean of its divisors is an integer number (69157848438).

Almost surely, 2^668159951866 is an apocalyptic number.

668159951866 is a deficient number, since it is larger than the sum of its proper divisors (438365623142).

668159951866 is a wasteful number, since it uses less digits than its factorization.

668159951866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365914637.

The product of its digits is 167961600, while the sum is 70.

The spelling of 668159951866 in words is "six hundred sixty-eight billion, one hundred fifty-nine million, nine hundred fifty-one thousand, eight hundred sixty-six".