165444361 has 4 divisors (see below), whose sum is σ = 165470724. Its totient is φ = 165418000.

The previous prime is 165444329. The next prime is 165444379. The reversal of 165444361 is 163444561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 74718736 + 90725625 = 8644^2 + 9525^2 .

It is a cyclic number.

It is not a de Polignac number, because 165444361 - 2⁵ = 165444329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165441361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2271 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (41367681).

Almost surely, 2^165444361 is an apocalyptic number.

It is an amenable number.

165444361 is a deficient number, since it is larger than the sum of its proper divisors (26363).

165444361 is a wasteful number, since it uses less digits than its factorization.

165444361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26362.

The product of its digits is 34560, while the sum is 34.

The square root of 165444361 is about 12862.5176773445. The cubic root of 165444361 is about 548.9725844330.

The spelling of 165444361 in words is "one hundred sixty-five million, four hundred forty-four thousand, three hundred sixty-one".