686191964922 has 48 divisors (see below), whose sum is σ = 1488655808640. Its totient is φ = 228437542656.

The previous prime is 686191964921. The next prime is 686191964981. The reversal of 686191964922 is 229469191686.

686191964922 is a `hidden beast` number, since 6 + 8 + 619 + 1 + 9 + 6 + 4 + 9 + 2 + 2 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 686191964922.

It is not an unprimeable number, because it can be changed into a prime (686191964921) 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 23 ways as a sum of consecutive naturals, for example, 50683338 + ... + 50696874.

It is an arithmetic number, because the mean of its divisors is an integer number (31013662680).

Almost surely, 2^686191964922 is an apocalyptic number.

686191964922 is an abundant number, since it is smaller than the sum of its proper divisors (802463843718).

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

686191964922 is a wasteful number, since it uses less digits than its factorization.

686191964922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16947 (or 16944 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The spelling of 686191964922 in words is "six hundred eighty-six billion, one hundred ninety-one million, nine hundred sixty-four thousand, nine hundred twenty-two".