165355559 has 2 divisors, whose sum is σ = 165355560. Its totient is φ = 165355558.

The previous prime is 165355529. The next prime is 165355571. The reversal of 165355559 is 955553561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165355559 - 2²⁰ = 164306983 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165355529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82677779 + 82677780.

It is an arithmetic number, because the mean of its divisors is an integer number (82677780).

Almost surely, 2^165355559 is an apocalyptic number.

165355559 is a deficient number, since it is larger than the sum of its proper divisors (1).

165355559 is an equidigital number, since it uses as much as digits as its factorization.

165355559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 506250, while the sum is 44.

The square root of 165355559 is about 12859.0652459656. The cubic root of 165355559 is about 548.8743467982.

The spelling of 165355559 in words is "one hundred sixty-five million, three hundred fifty-five thousand, five hundred fifty-nine".