685560368640 has 640 divisors, whose sum is σ = 2552848607232. Its totient is φ = 153714032640.

The previous prime is 685560368639. The next prime is 685560368743. The reversal of 685560368640 is 46863065586.

It is a tau number, because it is divible by the number of its divisors (640).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1118368974 + ... + 1118369586.

Almost surely, 2^685560368640 is an apocalyptic number.

685560368640 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 685560368640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1276424303616).

685560368640 is an abundant number, since it is smaller than the sum of its proper divisors (1867288238592).

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

685560368640 is a wasteful number, since it uses less digits than its factorization.

685560368640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010 (or 994 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 57.

The spelling of 685560368640 in words is "six hundred eighty-five billion, five hundred sixty million, three hundred sixty-eight thousand, six hundred forty".