857636618645 has 16 divisors (see below), whose sum is σ = 1079647470720. Its totient is φ = 653120059200.

The previous prime is 857636618623. The next prime is 857636618693. The reversal of 857636618645 is 546816636758.

It is a happy number.

It is not a de Polignac number, because 857636618645 - 2²⁰ = 857635570069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41642771 + ... + 41663360.

It is an arithmetic number, because the mean of its divisors is an integer number (67477966920).

Almost surely, 2^857636618645 is an apocalyptic number.

It is an amenable number.

857636618645 is a deficient number, since it is larger than the sum of its proper divisors (222010852075).

857636618645 is a wasteful number, since it uses less digits than its factorization.

857636618645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83306236.

The product of its digits is 174182400, while the sum is 65.

The spelling of 857636618645 in words is "eight hundred fifty-seven billion, six hundred thirty-six million, six hundred eighteen thousand, six hundred forty-five".