686135508637 has 4 divisors (see below), whose sum is σ = 694820768320. Its totient is φ = 677450248956.

The previous prime is 686135508601. The next prime is 686135508649. The reversal of 686135508637 is 736805531686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 686135508637 - 2¹⁵ = 686135475869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686135508137) 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, 4342629723 + ... + 4342629880.

It is an arithmetic number, because the mean of its divisors is an integer number (173705192080).

Almost surely, 2^686135508637 is an apocalyptic number.

It is an amenable number.

686135508637 is a deficient number, since it is larger than the sum of its proper divisors (8685259683).

686135508637 is an equidigital number, since it uses as much as digits as its factorization.

686135508637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8685259682.

The product of its (nonzero) digits is 21772800, while the sum is 58.

The spelling of 686135508637 in words is "six hundred eighty-six billion, one hundred thirty-five million, five hundred eight thousand, six hundred thirty-seven".