668896565698866 has 16 divisors (see below), whose sum is σ = 1337829344198784. Its totient is φ = 222959486432784.

The previous prime is 668896565698811. The next prime is 668896565698871.

668896565698866 is nontrivially palindromic in base 10.

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, 1508626581 + ... + 1509069896.

It is an arithmetic number, because the mean of its divisors is an integer number (83614334012424).

Almost surely, 2^{668896565698866} is an apocalyptic number.

668896565698866 is an abundant number, since it is smaller than the sum of its proper divisors (668932778499918).

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

668896565698866 is a wasteful number, since it uses less digits than its factorization.

668896565698866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017733425.

The product of its digits is 2321901158400, while the sum is 102.

The spelling of 668896565698866 in words is "six hundred sixty-eight trillion, eight hundred ninety-six billion, five hundred sixty-five million, six hundred ninety-eight thousand, eight hundred sixty-six".