686191964924 has 12 divisors (see below), whose sum is σ = 1205818662048. Its totient is φ = 341672347200.

The previous prime is 686191964921. The next prime is 686191964981. The reversal of 686191964924 is 429469191686.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 355907732 + ... + 355909659.

It is an arithmetic number, because the mean of its divisors is an integer number (100484888504).

Almost surely, 2^686191964924 is an apocalyptic number.

It is an amenable number.

686191964924 is a deficient number, since it is larger than the sum of its proper divisors (519626697124).

686191964924 is a wasteful number, since it uses less digits than its factorization.

686191964924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711817636 (or 711817634 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 65.

The spelling of 686191964924 in words is "six hundred eighty-six billion, one hundred ninety-one million, nine hundred sixty-four thousand, nine hundred twenty-four".