686719337922 has 54 divisors (see below), whose sum is σ = 1529481768633. Its totient is φ = 222677595504.

The previous prime is 686719337911. The next prime is 686719337951. The reversal of 686719337922 is 229733917686.

It can be written as a sum of positive squares in 2 ways, for example, as 554040546921 + 132678791001 = 744339^2 + 364251^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=585969.

It is a self number, because there is not a number n which added to its sum of digits gives 686719337922.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 130082479 + ... + 130087757.

Almost surely, 2^686719337922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686719337922

686719337922 is an abundant number, since it is smaller than the sum of its proper divisors (842762430711).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686719337922 is an frugal number, since it uses more digits than its factorization.

686719337922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10640 (or 5321 counting only the distinct ones).

The product of its digits is 41150592, while the sum is 63.

The spelling of 686719337922 in words is "six hundred eighty-six billion, seven hundred nineteen million, three hundred thirty-seven thousand, nine hundred twenty-two".