216166 has 8 divisors (see below), whose sum is σ = 335520. Its totient is φ = 104328.

The previous prime is 216157. The next prime is 216173. The reversal of 216166 is 661612.

216166 is nontrivially palindromic in base 6.

216166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806 + ... + 1921.

It is an arithmetic number, because the mean of its divisors is an integer number (41940).

2²¹⁶¹⁶⁶ is an apocalyptic number.

216166 is a deficient number, since it is larger than the sum of its proper divisors (119354).

216166 is a wasteful number, since it uses less digits than its factorization.

216166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3758.

The product of its digits is 432, while the sum is 22.

The square root of 216166 is about 464.9365548115. The cubic root of 216166 is about 60.0153664346.

Adding to 216166 its reverse (661612), we get a palindrome (877778).

The spelling of 216166 in words is "two hundred sixteen thousand, one hundred sixty-six".