165945441 has 4 divisors (see below), whose sum is σ = 221260592. Its totient is φ = 110630292.

The previous prime is 165945433. The next prime is 165945509. The reversal of 165945441 is 144549561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 165945441 - 2³ = 165945433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 165945441.

It is not an unprimeable number, because it can be changed into a prime (165945421) 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, 27657571 + ... + 27657576.

It is an arithmetic number, because the mean of its divisors is an integer number (55315148).

Almost surely, 2^165945441 is an apocalyptic number.

It is an amenable number.

165945441 is a deficient number, since it is larger than the sum of its proper divisors (55315151).

165945441 is an equidigital number, since it uses as much as digits as its factorization.

165945441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55315150.

The product of its digits is 86400, while the sum is 39.

The square root of 165945441 is about 12881.9812528974. The cubic root of 165945441 is about 549.5262487934.

The spelling of 165945441 in words is "one hundred sixty-five million, nine hundred forty-five thousand, four hundred forty-one".