685966219758120 has 64 divisors (see below), whose sum is σ = 2351884182030720. Its totient is φ = 156792278801664.

The previous prime is 685966219758103. The next prime is 685966219758179. The reversal of 685966219758120 is 21857912669586.

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, 408313225207 + ... + 408313226886.

It is an arithmetic number, because the mean of its divisors is an integer number (36748190344230).

Almost surely, 2^{685966219758120} is an apocalyptic number.

685966219758120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

685966219758120 is an abundant number, since it is smaller than the sum of its proper divisors (1665917962272600).

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

685966219758120 is a wasteful number, since it uses less digits than its factorization.

685966219758120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 816626452114 (or 816626452110 counting only the distinct ones).

The product of its (nonzero) digits is 783820800, while the sum is 75.

The spelling of 685966219758120 in words is "six hundred eighty-five trillion, nine hundred sixty-six billion, two hundred nineteen million, seven hundred fifty-eight thousand, one hundred twenty".