685915519585 has 16 divisors (see below), whose sum is σ = 858910490496. Its totient is φ = 524859225088.

The previous prime is 685915519519. The next prime is 685915519609. The reversal of 685915519585 is 585915519586.

685915519585 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 685915519585 - 2²¹ = 685913422433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 685915519585.

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, 5376102 + ... + 5502208.

It is an arithmetic number, because the mean of its divisors is an integer number (53681905656).

Almost surely, 2^685915519585 is an apocalyptic number.

It is an amenable number.

685915519585 is a deficient number, since it is larger than the sum of its proper divisors (172994970911).

685915519585 is a wasteful number, since it uses less digits than its factorization.

685915519585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173432.

The product of its digits is 97200000, while the sum is 67.

Subtracting from 685915519585 its reverse (585915519586), we obtain a palindrome (99999999999).

The spelling of 685915519585 in words is "six hundred eighty-five billion, nine hundred fifteen million, five hundred nineteen thousand, five hundred eighty-five".