165261559 has 2 divisors, whose sum is σ = 165261560. Its totient is φ = 165261558.

The previous prime is 165261533. The next prime is 165261581. The reversal of 165261559 is 955162561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165261559 is a prime.

It is a super-2 number, since 2×165261559² = 54622765766220962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165261059) 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, 82630779 + 82630780.

It is an arithmetic number, because the mean of its divisors is an integer number (82630780).

Almost surely, 2^165261559 is an apocalyptic number.

165261559 is a deficient number, since it is larger than the sum of its proper divisors (1).

165261559 is an equidigital number, since it uses as much as digits as its factorization.

165261559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 40.

The square root of 165261559 is about 12855.4097173136. The cubic root of 165261559 is about 548.7703205237.

The spelling of 165261559 in words is "one hundred sixty-five million, two hundred sixty-one thousand, five hundred fifty-nine".