166556 has 12 divisors (see below), whose sum is σ = 313992. Its totient is φ = 76848.

The previous prime is 166541. The next prime is 166561. The reversal of 166556 is 655661.

It is a super-2 number, since 2×166556² = 55481802272, which contains 22 as substring.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

166556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1550 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (26166).

2¹⁶⁶⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

166556 is a deficient number, since it is larger than the sum of its proper divisors (147436).

166556 is a wasteful number, since it uses less digits than its factorization.

166556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220 (or 3218 counting only the distinct ones).

The product of its digits is 5400, while the sum is 29.

The square root of 166556 is about 408.1127295246. The cubic root of 166556 is about 55.0199376752.

It can be divided in two parts, 16655 and 6, that added together give a palindrome (16661).

The spelling of 166556 in words is "one hundred sixty-six thousand, five hundred fifty-six".