688137968344 has 8 divisors (see below), whose sum is σ = 1290258690660. Its totient is φ = 344068984168.

The previous prime is 688137968291. The next prime is 688137968363. The reversal of 688137968344 is 443869731886.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×688137968344² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 688137968344.

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, 43008623014 + ... + 43008623029.

Almost surely, 2^688137968344 is an apocalyptic number.

It is an amenable number.

688137968344 is a deficient number, since it is larger than the sum of its proper divisors (602120722316).

688137968344 is a wasteful number, since it uses less digits than its factorization.

688137968344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86017246049 (or 86017246045 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 67.

The spelling of 688137968344 in words is "six hundred eighty-eight billion, one hundred thirty-seven million, nine hundred sixty-eight thousand, three hundred forty-four".