165242643 has 4 divisors (see below), whose sum is σ = 220323528. Its totient is φ = 110161760.

The previous prime is 165242579. The next prime is 165242653. The reversal of 165242643 is 346242561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165242643 - 2⁶ = 165242579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165242653) 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, 27540438 + ... + 27540443.

It is an arithmetic number, because the mean of its divisors is an integer number (55080882).

Almost surely, 2^165242643 is an apocalyptic number.

165242643 is a deficient number, since it is larger than the sum of its proper divisors (55080885).

165242643 is an equidigital number, since it uses as much as digits as its factorization.

165242643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55080884.

The product of its digits is 34560, while the sum is 33.

The square root of 165242643 is about 12854.6739748622. The cubic root of 165242643 is about 548.7493821286.

The spelling of 165242643 in words is "one hundred sixty-five million, two hundred forty-two thousand, six hundred forty-three".