165559 has 2 divisors, whose sum is σ = 165560. Its totient is φ = 165558.

The previous prime is 165553. The next prime is 165569. The reversal of 165559 is 955561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165559 - 2³ = 165551 is a prime.

It is a super-3 number, since 3×165559³ = 13613808533315637, which contains 333 as substring.

It is a plaindrome in base 14.

It is a zygodrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 165559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82779 + 82780.

It is an arithmetic number, because the mean of its divisors is an integer number (82780).

2¹⁶⁵⁵⁵⁹ is an apocalyptic number.

165559 is a deficient number, since it is larger than the sum of its proper divisors (1).

165559 is an equidigital number, since it uses as much as digits as its factorization.

165559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6750, while the sum is 31.

The square root of 165559 is about 406.8894198674. The cubic root of 165559 is about 54.9099352404.

It can be divided in two parts, 165 and 559, that multiplied together give a triangular number (92235 = T₄₂₉).

The spelling of 165559 in words is "one hundred sixty-five thousand, five hundred fifty-nine".