686643686960 has 320 divisors, whose sum is σ = 2030270054400. Its totient is φ = 209768832000.

The previous prime is 686643686951. The next prime is 686643687001. The reversal of 686643686960 is 69686346686.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 67637885 + ... + 67648035.

It is an arithmetic number, because the mean of its divisors is an integer number (6344593920).

Almost surely, 2^686643686960 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686643686960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1015135027200).

686643686960 is an abundant number, since it is smaller than the sum of its proper divisors (1343626367440).

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

686643686960 is a wasteful number, since it uses less digits than its factorization.

686643686960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10400 (or 10394 counting only the distinct ones).

The product of its (nonzero) digits is 322486272, while the sum is 68.

The spelling of 686643686960 in words is "six hundred eighty-six billion, six hundred forty-three million, six hundred eighty-six thousand, nine hundred sixty".