16669 has 4 divisors (see below), whose sum is σ = 16960.
Its totient is φ = 16380.
The previous prime is 16661. The next prime is 16673. The reversal of 16669 is 96661.
It is a happy number.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 16669 - 23 = 16661 is a prime.
It is a super-2 number, since 2×166692 = 555711122, which contains 22 as substring.
It is a Duffinian number.
It is a plaindrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (16661) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27 + ... + 184.
It is an arithmetic number, because the mean of its divisors is an integer number (4240).
216669 is an apocalyptic number.
It is an amenable number.
16669 is a deficient number, since it is larger than the sum of its proper divisors (291).
16669 is an equidigital number, since it uses as much as digits as its factorization.
16669 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 290.
The product of its digits is 1944, while the sum is 28.
The square root of 16669 is about 129.1084815185.
The cubic root of 16669 is about 25.5448397277.
Subtracting from 16669 its sum of digits (28), we obtain a square (16641 = 1292).
It can be divided in two parts, 1 and 6669, that added together give a triangular number (6670 = T115).
The spelling of 16669 in words is "sixteen thousand, six hundred sixty-nine".