165344243 has 2 divisors, whose sum is σ = 165344244. Its totient is φ = 165344242.

The previous prime is 165344239. The next prime is 165344273. The reversal of 165344243 is 342443561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165344243 - 2² = 165344239 is a prime.

It is not a weakly prime, because it can be changed into another prime (165344273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82672121 + 82672122.

It is an arithmetic number, because the mean of its divisors is an integer number (82672122).

Almost surely, 2^165344243 is an apocalyptic number.

165344243 is a deficient number, since it is larger than the sum of its proper divisors (1).

165344243 is an equidigital number, since it uses as much as digits as its factorization.

165344243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 32.

The square root of 165344243 is about 12858.6252375594. The cubic root of 165344243 is about 548.8618258931.

The spelling of 165344243 in words is "one hundred sixty-five million, three hundred forty-four thousand, two hundred forty-three".