16559 has 4 divisors (see below), whose sum is σ = 17160. Its totient is φ = 15960.

The previous prime is 16553. The next prime is 16561. The reversal of 16559 is 95561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 257 + ... + 314.

It is an arithmetic number, because the mean of its divisors is an integer number (4290).

2¹⁶⁵⁵⁹ is an apocalyptic number.

16559 is a deficient number, since it is larger than the sum of its proper divisors (601).

16559 is an equidigital number, since it uses as much as digits as its factorization.

16559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600.

The product of its digits is 1350, while the sum is 26.

The square root of 16559 is about 128.6817780418. The cubic root of 16559 is about 25.4885248895.

It can be divided in two parts, 16 and 559, that added together give a palindrome (575).

The spelling of 16559 in words is "sixteen thousand, five hundred fifty-nine".