165601560000 has 140 divisors (see below), whose sum is σ = 547517794472. Its totient is φ = 44160384000.

The previous prime is 165601559971. The next prime is 165601560037. The reversal of 165601560000 is 65106561.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 165601560000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 570007 + ... + 810006.

Almost surely, 2^165601560000 is an apocalyptic number.

165601560000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165601560000 is an abundant number, since it is smaller than the sum of its proper divisors (381916234472).

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

165601560000 is an equidigital number, since it uses as much as digits as its factorization.

165601560000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380048 (or 1380023 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

Adding to 165601560000 its reverse (65106561), we get a palindrome (165666666561).

The spelling of 165601560000 in words is "one hundred sixty-five billion, six hundred one million, five hundred sixty thousand".