668866713608 has 16 divisors (see below), whose sum is σ = 1254549827580. Its totient is φ = 334320092928.

The previous prime is 668866713607. The next prime is 668866713653. The reversal of 668866713608 is 806317668866.

It can be written as a sum of positive squares in 2 ways, for example, as 667387695844 + 1479017764 = 816938^2 + 38458^2 .

It is not an unprimeable number, because it can be changed into a prime (668866713607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14132885 + ... + 14180132.

Almost surely, 2^668866713608 is an apocalyptic number.

It is an amenable number.

668866713608 is a deficient number, since it is larger than the sum of its proper divisors (585683113972).

668866713608 is a wasteful number, since it uses less digits than its factorization.

668866713608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28315976 (or 28315972 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 65.

The spelling of 668866713608 in words is "six hundred sixty-eight billion, eight hundred sixty-six million, seven hundred thirteen thousand, six hundred eight".