688243736745 has 12 divisors (see below), whose sum is σ = 1192955810436. Its totient is φ = 367063326240.

The previous prime is 688243736731. The next prime is 688243736801. The reversal of 688243736745 is 547637342886.

688243736745 is a `hidden beast` number, since 68 + 82 + 437 + 3 + 67 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 463564892736 + 224678844009 = 680856^2 + 474003^2 .

It is not a de Polignac number, because 688243736745 - 2⁹ = 688243736233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7647152586 + ... + 7647152675.

It is an arithmetic number, because the mean of its divisors is an integer number (99412984203).

Almost surely, 2^688243736745 is an apocalyptic number.

It is an amenable number.

688243736745 is a deficient number, since it is larger than the sum of its proper divisors (504712073691).

688243736745 is a wasteful number, since it uses less digits than its factorization.

688243736745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15294305272 (or 15294305269 counting only the distinct ones).

The product of its digits is 162570240, while the sum is 63.

The spelling of 688243736745 in words is "six hundred eighty-eight billion, two hundred forty-three million, seven hundred thirty-six thousand, seven hundred forty-five".