22166 has 4 divisors (see below), whose sum is σ = 33252. Its totient is φ = 11082.

The previous prime is 22159. The next prime is 22171. The reversal of 22166 is 66122.

It is a semiprime because it is the product of two primes.

It is a plaindrome in base 9.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 22166.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5540 + ... + 5543.

It is an arithmetic number, because the mean of its divisors is an integer number (8313).

2²²¹⁶⁶ is an apocalyptic number.

22166 is a deficient number, since it is larger than the sum of its proper divisors (11086).

22166 is a wasteful number, since it uses less digits than its factorization.

22166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11085.

The product of its digits is 144, while the sum is 17.

The square root of 22166 is about 148.8825040090. The cubic root of 22166 is about 28.0906923239.

Subtracting from 22166 its product of digits (144), we obtain a palindrome (22022).

Adding to 22166 its reverse (66122), we get a palindrome (88288).

Subtracting 22166 from its reverse (66122), we obtain a triangular number (43956 = T₂₉₆).

It can be divided in two parts, 2216 and 6, that added together give a palindrome (2222).

The spelling of 22166 in words is "twenty-two thousand, one hundred sixty-six".