165240243 has 28 divisors (see below), whose sum is σ = 283148208. Its totient is φ = 94420080.

The previous prime is 165240227. The next prime is 165240253. The reversal of 165240243 is 342042561.

165240243 is a `hidden beast` number, since 1 + 652 + 4 + 0 + 2 + 4 + 3 = 666.

It is not a de Polignac number, because 165240243 - 2⁴ = 165240227 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (165240223) 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 27 ways as a sum of consecutive naturals, for example, 11088 + ... + 21293.

It is an arithmetic number, because the mean of its divisors is an integer number (10112436).

Almost surely, 2^165240243 is an apocalyptic number.

165240243 is a deficient number, since it is larger than the sum of its proper divisors (117907965).

165240243 is an frugal number, since it uses more digits than its factorization.

165240243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32406 (or 32391 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 165240243 is about 12854.5806232642. The cubic root of 165240243 is about 548.7467254195.

The spelling of 165240243 in words is "one hundred sixty-five million, two hundred forty thousand, two hundred forty-three".