686392805952 has 168 divisors, whose sum is σ = 2347315823520. Its totient is φ = 196112206080.

The previous prime is 686392805951. The next prime is 686392805993. The reversal of 686392805952 is 259508293686.

686392805952 is a `hidden beast` number, since 6 + 8 + 6 + 39 + 2 + 8 + 0 + 595 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×686392805952² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a self number, because there is not a number n which added to its sum of digits gives 686392805952.

It is not an unprimeable number, because it can be changed into a prime (686392805951) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3968574 + ... + 4137917.

Almost surely, 2^686392805952 is an apocalyptic number.

It is an amenable number.

686392805952 is an abundant number, since it is smaller than the sum of its proper divisors (1660923017568).

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

686392805952 is a wasteful number, since it uses less digits than its factorization.

686392805952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106526 (or 8106503 counting only the distinct ones).

The product of its (nonzero) digits is 55987200, while the sum is 63.

The spelling of 686392805952 in words is "six hundred eighty-six billion, three hundred ninety-two million, eight hundred five thousand, nine hundred fifty-two".