686615871825960 has 64 divisors (see below), whose sum is σ = 2126294312762880. Its totient is φ = 177191192728320.

The previous prime is 686615871825943. The next prime is 686615871826037. The reversal of 686615871825960 is 69528178516686.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92287075827 + ... + 92287083266.

It is an arithmetic number, because the mean of its divisors is an integer number (33223348636920).

Almost surely, 2^{686615871825960} is an apocalyptic number.

686615871825960 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686615871825960 is an abundant number, since it is smaller than the sum of its proper divisors (1439678440936920).

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

686615871825960 is a wasteful number, since it uses less digits than its factorization.

686615871825960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184574159138 (or 184574159134 counting only the distinct ones).

The product of its (nonzero) digits is 2090188800, while the sum is 78.

The spelling of 686615871825960 in words is "six hundred eighty-six trillion, six hundred fifteen billion, eight hundred seventy-one million, eight hundred twenty-five thousand, nine hundred sixty".