166122220 has 48 divisors (see below), whose sum is σ = 382602528. Its totient is φ = 60085760.

The previous prime is 166122191. The next prime is 166122247. The reversal of 166122220 is 22221661.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 166122191 and 166122200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41424 + ... + 45256.

It is an arithmetic number, because the mean of its divisors is an integer number (7970886).

Almost surely, 2^166122220 is an apocalyptic number.

166122220 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 166122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (191301264).

166122220 is an abundant number, since it is smaller than the sum of its proper divisors (216480308).

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

166122220 is a wasteful number, since it uses less digits than its factorization.

166122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050 (or 4048 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 166122220 is about 12888.8409098724. The cubic root of 166122220 is about 549.7213133580.

Adding to 166122220 its reverse (22221661), we get a palindrome (188343881).

The spelling of 166122220 in words is "one hundred sixty-six million, one hundred twenty-two thousand, two hundred twenty".