16659 has 8 divisors (see below), whose sum is σ = 24720. Its totient is φ = 11088.

The previous prime is 16657. The next prime is 16661. The reversal of 16659 is 95661.

16659 is a `hidden beast` number, since 1 + 6 + 659 = 666.

16659 is nontrivially palindromic in base 7.

16659 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (16657) and next prime (16661).

It is not a de Polignac number, because 16659 - 2¹ = 16657 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 617 = 16659 / (1 + 6 + 6 + 5 + 9).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (16651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282 + ... + 335.

It is an arithmetic number, because the mean of its divisors is an integer number (3090).

2¹⁶⁶⁵⁹ is an apocalyptic number.

16659 is a deficient number, since it is larger than the sum of its proper divisors (8061).

16659 is an equidigital number, since it uses as much as digits as its factorization.

16659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626 (or 620 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 16659 is about 129.0697485858. The cubic root of 16659 is about 25.5397304531.

It can be divided in two parts, 166 and 59, that added together give a square (225 = 15²).

The spelling of 16659 in words is "sixteen thousand, six hundred fifty-nine".