685686585 has 32 divisors (see below), whose sum is σ = 1201703040. Its totient is φ = 332315648.

The previous prime is 685686581. The next prime is 685686593. The reversal of 685686585 is 585686586.

It is a cyclic number.

It is not a de Polignac number, because 685686585 - 2² = 685686581 is a prime.

It is not an unprimeable number, because it can be changed into a prime (685686581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38967 + ... + 53756.

It is an arithmetic number, because the mean of its divisors is an integer number (37553220).

Almost surely, 2^685686585 is an apocalyptic number.

It is an amenable number.

685686585 is a deficient number, since it is larger than the sum of its proper divisors (516016455).

685686585 is a wasteful number, since it uses less digits than its factorization.

685686585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92777.

The product of its digits is 13824000, while the sum is 57.

The square root of 685686585 is about 26185.6179037272. The cubic root of 685686585 is about 881.8104021687.

Subtracting from 685686585 its reverse (585686586), we obtain a palindrome (99999999).

The spelling of 685686585 in words is "six hundred eighty-five million, six hundred eighty-six thousand, five hundred eighty-five".