165685813632 has 112 divisors (see below), whose sum is σ = 494889698580. Its totient is φ = 55228573440.

The previous prime is 165685813603. The next prime is 165685813649. The reversal of 165685813632 is 236318586561.

It is a happy number.

165685813632 is a `hidden beast` number, since 1 + 6 + 56 + 8 + 581 + 3 + 6 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 794494 + ... + 981117.

Almost surely, 2^165685813632 is an apocalyptic number.

165685813632 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165685813632 is an abundant number, since it is smaller than the sum of its proper divisors (329203884948).

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

165685813632 is an frugal number, since it uses more digits than its factorization.

165685813632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1775643 (or 1775616 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 54.

The spelling of 165685813632 in words is "one hundred sixty-five billion, six hundred eighty-five million, eight hundred thirteen thousand, six hundred thirty-two".