318687875057 has 4 divisors (see below), whose sum is σ = 321611617140. Its totient is φ = 315764132976.

The previous prime is 318687875039. The next prime is 318687875063. The reversal of 318687875057 is 750578786813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750578786813 = 439 ⋅1709746667.

It can be written as a sum of positive squares in 2 ways, for example, as 187180830736 + 131507044321 = 432644^2 + 362639^2 .

It is a cyclic number.

It is not a de Polignac number, because 318687875057 - 2⁶ = 318687874993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 318687874984 and 318687875002.

It is not an unprimeable number, because it can be changed into a prime (318687835057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1461870878 + ... + 1461871095.

It is an arithmetic number, because the mean of its divisors is an integer number (80402904285).

Almost surely, 2^318687875057 is an apocalyptic number.

It is an amenable number.

318687875057 is a deficient number, since it is larger than the sum of its proper divisors (2923742083).

318687875057 is a wasteful number, since it uses less digits than its factorization.

318687875057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923742082.

The product of its (nonzero) digits is 79027200, while the sum is 65.

The spelling of 318687875057 in words is "three hundred eighteen billion, six hundred eighty-seven million, eight hundred seventy-five thousand, fifty-seven".