668140073408 has 14 divisors (see below), whose sum is σ = 1325840458296. Its totient is φ = 334070036672.

The previous prime is 668140073389. The next prime is 668140073417. The reversal of 668140073408 is 804370041866.

It is a happy number.

It is a super-2 number, since 2×668140073408² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5219844260 + ... + 5219844387.

Almost surely, 2^668140073408 is an apocalyptic number.

It is an amenable number.

668140073408 is a deficient number, since it is larger than the sum of its proper divisors (657700384888).

668140073408 is a wasteful number, since it uses less digits than its factorization.

668140073408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10439688659 (or 10439688649 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 47.

The spelling of 668140073408 in words is "six hundred sixty-eight billion, one hundred forty million, seventy-three thousand, four hundred eight".