686238714491 has 16 divisors (see below), whose sum is σ = 765263829120. Its totient is φ = 610120874880.

The previous prime is 686238714479. The next prime is 686238714529. The reversal of 686238714491 is 194417832686.

It is not a de Polignac number, because 686238714491 - 2¹⁰ = 686238713467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686238714491.

It is not an unprimeable number, because it can be changed into a prime (686238714431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3246926 + ... + 3451811.

It is an arithmetic number, because the mean of its divisors is an integer number (47828989320).

Almost surely, 2^686238714491 is an apocalyptic number.

686238714491 is a deficient number, since it is larger than the sum of its proper divisors (79025114629).

686238714491 is a wasteful number, since it uses less digits than its factorization.

686238714491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6698954.

The product of its digits is 13934592, while the sum is 59.

The spelling of 686238714491 in words is "six hundred eighty-six billion, two hundred thirty-eight million, seven hundred fourteen thousand, four hundred ninety-one".