688661525768 has 48 divisors (see below), whose sum is σ = 1342424863440. Its totient is φ = 331178401440.

The previous prime is 688661525767. The next prime is 688661525801. The reversal of 688661525768 is 867525166886.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 688661525698 and 688661525707.

It is not an unprimeable number, because it can be changed into a prime (688661525767) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 978371 + ... + 1527917.

It is an arithmetic number, because the mean of its divisors is an integer number (27967184655).

Almost surely, 2^688661525768 is an apocalyptic number.

It is an amenable number.

688661525768 is a deficient number, since it is larger than the sum of its proper divisors (653763337672).

688661525768 is a wasteful number, since it uses less digits than its factorization.

688661525768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549778 (or 549743 counting only the distinct ones).

The product of its digits is 232243200, while the sum is 68.

The spelling of 688661525768 in words is "six hundred eighty-eight billion, six hundred sixty-one million, five hundred twenty-five thousand, seven hundred sixty-eight".