215166 has 32 divisors (see below), whose sum is σ = 506880. Its totient is φ = 59616.

The previous prime is 215161. The next prime is 215179. The reversal of 215166 is 661512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

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 215166.

It is not an unprimeable number, because it can be changed into a prime (215161) by changing a digit.

215166 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 15 ways as a sum of consecutive naturals, for example, 1920 + ... + 2028.

It is an arithmetic number, because the mean of its divisors is an integer number (15840).

2²¹⁵¹⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253440).

215166 is an abundant number, since it is smaller than the sum of its proper divisors (291714).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215166 is a wasteful number, since it uses less digits than its factorization.

215166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168.

The product of its digits is 360, while the sum is 21.

The square root of 215166 is about 463.8598926400. The cubic root of 215166 is about 59.9226781762.

Adding to 215166 its reverse (661512), we get a palindrome (876678).

The spelling of 215166 in words is "two hundred fifteen thousand, one hundred sixty-six".