318688636257 has 12 divisors (see below), whose sum is σ = 460926646180. Its totient is φ = 212182806528.

The previous prime is 318688636241. The next prime is 318688636267. The reversal of 318688636257 is 752636886813.

It is a happy number.

318688636257 is a `hidden beast` number, since 318 + 6 + 8 + 8 + 63 + 6 + 257 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 134202064896 + 184486571361 = 366336^2 + 429519^2 .

It is not a de Polignac number, because 318688636257 - 2⁴ = 318688636241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 318688636194 and 318688636203.

It is not an unprimeable number, because it can be changed into a prime (318688636267) 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, 23016388 + ... + 23030229.

Almost surely, 2^318688636257 is an apocalyptic number.

It is an amenable number.

318688636257 is a deficient number, since it is larger than the sum of its proper divisors (142238009923).

318688636257 is a wasteful number, since it uses less digits than its factorization.

318688636257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46047392 (or 46047389 counting only the distinct ones).

The product of its digits is 69672960, while the sum is 63.

The spelling of 318688636257 in words is "three hundred eighteen billion, six hundred eighty-eight million, six hundred thirty-six thousand, two hundred fifty-seven".