686768971632 has 20 divisors (see below), whose sum is σ = 1774153176840. Its totient is φ = 228922990528.

The previous prime is 686768971589. The next prime is 686768971723. The reversal of 686768971632 is 236179867686.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7153843407 + ... + 7153843502.

It is an arithmetic number, because the mean of its divisors is an integer number (88707658842).

Almost surely, 2^686768971632 is an apocalyptic number.

It is an amenable number.

686768971632 is an abundant number, since it is smaller than the sum of its proper divisors (1087384205208).

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

686768971632 is a wasteful number, since it uses less digits than its factorization.

686768971632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14307686920 (or 14307686914 counting only the distinct ones).

The product of its digits is 219469824, while the sum is 69.

The spelling of 686768971632 in words is "six hundred eighty-six billion, seven hundred sixty-eight million, nine hundred seventy-one thousand, six hundred thirty-two".