685602899170560 has 1728 divisors, whose sum is σ = 2981991129062400. Its totient is φ = 148317707059200.

The previous prime is 685602899170523. The next prime is 685602899170589. The reversal of 685602899170560 is 65071998206586.

685602899170560 is a `hidden beast` number, since 6 + 8 + 5 + 602 + 8 + 9 + 9 + 1 + 7 + 0 + 5 + 6 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1728).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 35103307995 + ... + 35103327525.

It is an arithmetic number, because the mean of its divisors is an integer number (1725689310800).

Almost surely, 2^{685602899170560} is an apocalyptic number.

685602899170560 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 685602899170560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1490995564531200).

685602899170560 is an abundant number, since it is smaller than the sum of its proper divisors (2296388229891840).

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

685602899170560 is a wasteful number, since it uses less digits than its factorization.

685602899170560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20685 (or 20658 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 72.

The spelling of 685602899170560 in words is "six hundred eighty-five trillion, six hundred two billion, eight hundred ninety-nine million, one hundred seventy thousand, five hundred sixty".