16646 has 16 divisors (see below), whose sum is σ = 30240. Its totient is φ = 6720.

The previous prime is 16633. The next prime is 16649. The reversal of 16646 is 64661.

16646 = 63² + 64² + ... + 66².

It is a nialpdrome in base 12 and base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386 + ... + 426.

It is an arithmetic number, because the mean of its divisors is an integer number (1890).

2¹⁶⁶⁴⁶ is an apocalyptic number.

16646 is a deficient number, since it is larger than the sum of its proper divisors (13594).

16646 is a wasteful number, since it uses less digits than its factorization.

16646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79.

The product of its digits is 864, while the sum is 23.

The square root of 16646 is about 129.0193783894. The cubic root of 16646 is about 25.5330853384.

It can be divided in two parts, 166 and 46, that added together give a palindrome (212).

The spelling of 16646 in words is "sixteen thousand, six hundred forty-six".