686564363431 has 12 divisors (see below), whose sum is σ = 718711449120. Its totient is φ = 655800004640.

The previous prime is 686564363423. The next prime is 686564363447. The reversal of 686564363431 is 134363465686.

It is a happy number.

It is not a de Polignac number, because 686564363431 - 2³ = 686564363423 is a prime.

It is a super-2 number, since 2×686564363431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686564363131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 522190 + ... + 1282891.

It is an arithmetic number, because the mean of its divisors is an integer number (59892620760).

Almost surely, 2^686564363431 is an apocalyptic number.

686564363431 is a deficient number, since it is larger than the sum of its proper divisors (32147085689).

686564363431 is a wasteful number, since it uses less digits than its factorization.

686564363431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805846 (or 1805823 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 55.

The spelling of 686564363431 in words is "six hundred eighty-six billion, five hundred sixty-four million, three hundred sixty-three thousand, four hundred thirty-one".