165405043 has 2 divisors, whose sum is σ = 165405044. Its totient is φ = 165405042.

The previous prime is 165405017. The next prime is 165405073. The reversal of 165405043 is 340504561.

It is a weak prime.

It is an emirp because it is prime and its reverse (340504561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165405043 - 2¹³ = 165396851 is a prime.

It is not a weakly prime, because it can be changed into another prime (165405073) 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 as a sum of consecutive naturals, namely, 82702521 + 82702522.

It is an arithmetic number, because the mean of its divisors is an integer number (82702522).

Almost surely, 2^165405043 is an apocalyptic number.

165405043 is a deficient number, since it is larger than the sum of its proper divisors (1).

165405043 is an equidigital number, since it uses as much as digits as its factorization.

165405043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 165405043 is about 12860.9891921267. The cubic root of 165405043 is about 548.9290930461.

The spelling of 165405043 in words is "one hundred sixty-five million, four hundred five thousand, forty-three".