668834707438866 has 32 divisors (see below), whose sum is σ = 1383797562768000. Its totient is φ = 215256895790720.

The previous prime is 668834707438823. The next prime is 668834707438907.

668834707438866 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198674206 + ... + 202012646.

It is an arithmetic number, because the mean of its divisors is an integer number (43243673836500).

Almost surely, 2^{668834707438866} is an apocalyptic number.

668834707438866 is an abundant number, since it is smaller than the sum of its proper divisors (714962855329134).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668834707438866 is a wasteful number, since it uses less digits than its factorization.

668834707438866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489874.

The product of its (nonzero) digits is 37456183296, while the sum is 84.

The spelling of 668834707438866 in words is "six hundred sixty-eight trillion, eight hundred thirty-four billion, seven hundred seven million, four hundred thirty-eight thousand, eight hundred sixty-six".