166220 has 12 divisors (see below), whose sum is σ = 349104. Its totient is φ = 66480.

The previous prime is 166219. The next prime is 166237. The reversal of 166220 is 22661.

It is a zygodrome in base 3.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4136 + ... + 4175.

It is an arithmetic number, because the mean of its divisors is an integer number (29092).

2¹⁶⁶²²⁰ is an apocalyptic number.

166220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166220 is an abundant number, since it is smaller than the sum of its proper divisors (182884).

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

166220 is a wasteful number, since it uses less digits than its factorization.

166220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8320 (or 8318 counting only the distinct ones).

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

The square root of 166220 is about 407.7008707374. The cubic root of 166220 is about 54.9829148034.

Adding to 166220 its reverse (22661), we get a palindrome (188881).

The spelling of 166220 in words is "one hundred sixty-six thousand, two hundred twenty".