687685676675625 has 100 divisors (see below), whose sum is σ = 1285918340451492. Its totient is φ = 366130036224000.

The previous prime is 687685676675603. The next prime is 687685676675717. The reversal of 687685676675625 is 526576676586786.

It can be written as a sum of positive squares in 10 ways, for example, as 279090068468121 + 408595608207504 = 16705989^2 + 20213748^2 .

It is not a de Polignac number, because 687685676675625 - 2⁷ = 687685676675497 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 17439469 + ... + 40981781.

Almost surely, 2^{687685676675625} is an apocalyptic number.

It is an amenable number.

687685676675625 is a deficient number, since it is larger than the sum of its proper divisors (598232663775867).

687685676675625 is an equidigital number, since it uses as much as digits as its factorization.

687685676675625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23542922 (or 23542898 counting only the distinct ones).

The product of its digits is 256048128000, while the sum is 90.

The spelling of 687685676675625 in words is "six hundred eighty-seven trillion, six hundred eighty-five billion, six hundred seventy-six million, six hundred seventy-five thousand, six hundred twenty-five".