686966824064 has 64 divisors (see below), whose sum is σ = 1379166480000. Its totient is φ = 340833303552.

The previous prime is 686966824051. The next prime is 686966824073. The reversal of 686966824064 is 460428669686.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8617862 + ... + 8697210.

It is an arithmetic number, because the mean of its divisors is an integer number (21549476250).

Almost surely, 2^686966824064 is an apocalyptic number.

686966824064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 686966824064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (689583240000).

686966824064 is an abundant number, since it is smaller than the sum of its proper divisors (692199655936).

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

686966824064 is a wasteful number, since it uses less digits than its factorization.

686966824064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79885 (or 79873 counting only the distinct ones).

The product of its (nonzero) digits is 143327232, while the sum is 65.

The spelling of 686966824064 in words is "six hundred eighty-six billion, nine hundred sixty-six million, eight hundred twenty-four thousand, sixty-four".