165545588243 has 32 divisors (see below), whose sum is σ = 215771466240. Its totient is φ = 123578058240.

The previous prime is 165545588237. The next prime is 165545588261. The reversal of 165545588243 is 342885545561.

It is a happy number.

It is not a de Polignac number, because 165545588243 - 2²² = 165541393939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165545588203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 754148 + ... + 948593.

It is an arithmetic number, because the mean of its divisors is an integer number (6742858320).

Almost surely, 2^165545588243 is an apocalyptic number.

165545588243 is a deficient number, since it is larger than the sum of its proper divisors (50225877997).

165545588243 is a wasteful number, since it uses less digits than its factorization.

165545588243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702827.

The product of its digits is 23040000, while the sum is 56.

The spelling of 165545588243 in words is "one hundred sixty-five billion, five hundred forty-five million, five hundred eighty-eight thousand, two hundred forty-three".