16556 has 6 divisors (see below), whose sum is σ = 28980. Its totient is φ = 8276.

The previous prime is 16553. The next prime is 16561. The reversal of 16556 is 65561.

It is a super-2 number, since 2×16556² = 548202272, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 16556.

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 (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2066 + ... + 2073.

It is an arithmetic number, because the mean of its divisors is an integer number (4830).

2¹⁶⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

16556 is a deficient number, since it is larger than the sum of its proper divisors (12424).

16556 is a wasteful number, since it uses less digits than its factorization.

16556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4143 (or 4141 counting only the distinct ones).

The product of its digits is 900, while the sum is 23.

The square root of 16556 is about 128.6701208517. The cubic root of 16556 is about 25.4869855414.

It can be divided in two parts, 1655 and 6, that added together give a palindrome (1661).

The spelling of 16556 in words is "sixteen thousand, five hundred fifty-six".