685615516585 has 32 divisors (see below), whose sum is σ = 901356595200. Its totient is φ = 498326277120.

The previous prime is 685615516561. The next prime is 685615516603. The reversal of 685615516585 is 585615516586.

It is not a de Polignac number, because 685615516585 - 2¹¹ = 685615514537 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13460596 + ... + 13511434.

It is an arithmetic number, because the mean of its divisors is an integer number (28167393600).

Almost surely, 2^685615516585 is an apocalyptic number.

It is an amenable number.

685615516585 is a deficient number, since it is larger than the sum of its proper divisors (215741078615).

685615516585 is a wasteful number, since it uses less digits than its factorization.

685615516585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56361.

The product of its digits is 43200000, while the sum is 61.

Subtracting from 685615516585 its reverse (585615516586), we obtain a palindrome (99999999999).

The spelling of 685615516585 in words is "six hundred eighty-five billion, six hundred fifteen million, five hundred sixteen thousand, five hundred eighty-five".