685960591680 has 1120 divisors, whose sum is σ = 3180021901056. Its totient is φ = 136208646144.

The previous prime is 685960591621. The next prime is 685960591681. The reversal of 685960591680 is 86195069586.

685960591680 is a `hidden beast` number, since 6 + 8 + 5 + 9 + 605 + 9 + 16 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685960591681) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 40089687 + ... + 40106793.

Almost surely, 2^685960591680 is an apocalyptic number.

685960591680 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 685960591680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1590010950528).

685960591680 is an abundant number, since it is smaller than the sum of its proper divisors (2494061309376).

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

685960591680 is a wasteful number, since it uses less digits than its factorization.

685960591680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17173 (or 17154 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 63.

The spelling of 685960591680 in words is "six hundred eighty-five billion, nine hundred sixty million, five hundred ninety-one thousand, six hundred eighty".