687634270625 has 20 divisors (see below), whose sum is σ = 859353909348. Its totient is φ = 550052280000.

The previous prime is 687634270579. The next prime is 687634270637. The reversal of 687634270625 is 526072436786.

It can be written as a sum of positive squares in 10 ways, for example, as 444324896929 + 243309373696 = 666577^2 + 493264^2 .

It is not a de Polignac number, because 687634270625 - 2²² = 687630076321 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6883535 + ... + 6982715.

Almost surely, 2^687634270625 is an apocalyptic number.

It is an amenable number.

687634270625 is a deficient number, since it is larger than the sum of its proper divisors (171719638723).

687634270625 is an equidigital number, since it uses as much as digits as its factorization.

687634270625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110294 (or 110279 counting only the distinct ones).

The product of its (nonzero) digits is 20321280, while the sum is 56.

The spelling of 687634270625 in words is "six hundred eighty-seven billion, six hundred thirty-four million, two hundred seventy thousand, six hundred twenty-five".