165541230720 has 96 divisors (see below), whose sum is σ = 571634582220. Its totient is φ = 44144326656.

The previous prime is 165541230703. The next prime is 165541230739. The reversal of 165541230720 is 27032145561.

165541230720 is a `hidden beast` number, since 1 + 6 + 554 + 1 + 2 + 30 + 72 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 161816325696 + 3724905024 = 402264^2 + 61032^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14364139 + ... + 14375658.

Almost surely, 2^165541230720 is an apocalyptic number.

165541230720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165541230720 is an abundant number, since it is smaller than the sum of its proper divisors (406093351500).

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

165541230720 is a wasteful number, since it uses less digits than its factorization.

165541230720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28739822 (or 28739807 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 165541230720 in words is "one hundred sixty-five billion, five hundred forty-one million, two hundred thirty thousand, seven hundred twenty".