685365805056 has 240 divisors, whose sum is σ = 1862446920768. Its totient is φ = 224133120000.

The previous prime is 685365805021. The next prime is 685365805093. The reversal of 685365805056 is 650508563586.

It is a junction number, because it is equal to n+sod(n) for n = 685365804987 and 685365805005.

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, 900611716 + ... + 900612476.

Almost surely, 2^685365805056 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 685365805056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (931223460384).

685365805056 is an abundant number, since it is smaller than the sum of its proper divisors (1177081115712).

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

685365805056 is an equidigital number, since it uses as much as digits as its factorization.

685365805056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1090 counting only the distinct ones).

The product of its (nonzero) digits is 25920000, while the sum is 57.

The spelling of 685365805056 in words is "six hundred eighty-five billion, three hundred sixty-five million, eight hundred five thousand, fifty-six".