686344834559 has 4 divisors (see below), whose sum is σ = 686364424200. Its totient is φ = 686325244920.

The previous prime is 686344834547. The next prime is 686344834579. The reversal of 686344834559 is 955438443686.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 955438443686 = 2 ⋅477719221843.

It is a cyclic number.

It is not a de Polignac number, because 686344834559 - 2²⁸ = 686076399103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 686344834495 and 686344834504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686344834579) 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, 9742172 + ... + 9812369.

It is an arithmetic number, because the mean of its divisors is an integer number (171591106050).

Almost surely, 2^686344834559 is an apocalyptic number.

686344834559 is a deficient number, since it is larger than the sum of its proper divisors (19589641).

686344834559 is a wasteful number, since it uses less digits than its factorization.

686344834559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19589640.

The product of its digits is 298598400, while the sum is 65.

The spelling of 686344834559 in words is "six hundred eighty-six billion, three hundred forty-four million, eight hundred thirty-four thousand, five hundred fifty-nine".