685642564320 has 192 divisors, whose sum is σ = 2468721991680. Its totient is φ = 156692348928.

The previous prime is 685642564319. The next prime is 685642564351. The reversal of 685642564320 is 23465246586.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26440321 + ... + 26466239.

It is an arithmetic number, because the mean of its divisors is an integer number (12857927040).

Almost surely, 2^685642564320 is an apocalyptic number.

685642564320 is a gapful number since it is divisible by the number (60) 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 685642564320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1234360995840).

685642564320 is an abundant number, since it is smaller than the sum of its proper divisors (1783079427360).

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

685642564320 is a wasteful number, since it uses less digits than its factorization.

685642564320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33817 (or 33809 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 51.

The spelling of 685642564320 in words is "six hundred eighty-five billion, six hundred forty-two million, five hundred sixty-four thousand, three hundred twenty".