166220220 has 96 divisors (see below), whose sum is σ = 497726208. Its totient is φ = 41300992.

The previous prime is 166220213. The next prime is 166220251. The reversal of 166220220 is 22022661.

166220220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108379 + ... + 109901.

It is an arithmetic number, because the mean of its divisors is an integer number (5184648).

Almost surely, 2^166220220 is an apocalyptic number.

166220220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166220220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248863104).

166220220 is an abundant number, since it is smaller than the sum of its proper divisors (331505988).

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

166220220 is a wasteful number, since it uses less digits than its factorization.

166220220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659 (or 1657 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 166220220 is about 12892.6420876405. The cubic root of 166220220 is about 549.8293906088.

Adding to 166220220 its reverse (22022661), we get a palindrome (188242881).

The spelling of 166220220 in words is "one hundred sixty-six million, two hundred twenty thousand, two hundred twenty".