685165536000 has 864 divisors, whose sum is σ = 2831359265280. Its totient is φ = 157344768000.

The previous prime is 685165535987. The next prime is 685165536059. The reversal of 685165536000 is 635561586.

685165536000 is a `hidden beast` number, since 6 + 8 + 51 + 65 + 536 + 0 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 60186309 + ... + 60197691.

Almost surely, 2^685165536000 is an apocalyptic number.

685165536000 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 685165536000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1415679632640).

685165536000 is an abundant number, since it is smaller than the sum of its proper divisors (2146193729280).

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

685165536000 is a wasteful number, since it uses less digits than its factorization.

685165536000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11450 (or 11423 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 45.

The spelling of 685165536000 in words is "six hundred eighty-five billion, one hundred sixty-five million, five hundred thirty-six thousand".