685864935859 has 4 divisors (see below), whose sum is σ = 726209932104. Its totient is φ = 645519939616.

The previous prime is 685864935827. The next prime is 685864935871. The reversal of 685864935859 is 958539468586.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 685864935859 - 2⁵ = 685864935827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685864935659) 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, 20172498097 + ... + 20172498130.

It is an arithmetic number, because the mean of its divisors is an integer number (181552483026).

Almost surely, 2^685864935859 is an apocalyptic number.

685864935859 is a deficient number, since it is larger than the sum of its proper divisors (40344996245).

685864935859 is a wasteful number, since it uses less digits than its factorization.

685864935859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40344996244.

The product of its digits is 2239488000, while the sum is 76.

The spelling of 685864935859 in words is "six hundred eighty-five billion, eight hundred sixty-four million, nine hundred thirty-five thousand, eight hundred fifty-nine".