165545097599 has 32 divisors (see below), whose sum is σ = 200199912576. Its totient is φ = 133936312320.

The previous prime is 165545097583. The next prime is 165545097607. The reversal of 165545097599 is 995790545561.

It is a cyclic number.

It is not a de Polignac number, because 165545097599 - 2⁴ = 165545097583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165545097199) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1081559 + ... + 1225095.

It is an arithmetic number, because the mean of its divisors is an integer number (6256247268).

Almost surely, 2^165545097599 is an apocalyptic number.

165545097599 is a deficient number, since it is larger than the sum of its proper divisors (34654814977).

165545097599 is a wasteful number, since it uses less digits than its factorization.

165545097599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143715.

The product of its (nonzero) digits is 76545000, while the sum is 65.

The spelling of 165545097599 in words is "one hundred sixty-five billion, five hundred forty-five million, ninety-seven thousand, five hundred ninety-nine".