166215 has 16 divisors (see below), whose sum is σ = 304128. Its totient is φ = 75936.

The previous prime is 166207. The next prime is 166219. The reversal of 166215 is 512661.

It is a happy number.

It is not a de Polignac number, because 166215 - 2³ = 166207 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 166191 and 166200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 687 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (19008).

2¹⁶⁶²¹⁵ is an apocalyptic number.

166215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166215 is a deficient number, since it is larger than the sum of its proper divisors (137913).

166215 is a wasteful number, since it uses less digits than its factorization.

166215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1598.

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

The square root of 166215 is about 407.6947387446. The cubic root of 166215 is about 54.9823634912.

Adding to 166215 its reverse (512661), we get a palindrome (678876).

The spelling of 166215 in words is "one hundred sixty-six thousand, two hundred fifteen".