166605222 has 64 divisors (see below), whose sum is σ = 402812928. Its totient is φ = 44928000.

The previous prime is 166605217. The next prime is 166605239. The reversal of 166605222 is 222506661.

It is a super-3 number, since 3×166605222³ (a number of 26 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166605222.

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, 51822 + ... + 54942.

It is an arithmetic number, because the mean of its divisors is an integer number (6293952).

Almost surely, 2^166605222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166605222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201406464).

166605222 is an abundant number, since it is smaller than the sum of its proper divisors (236207706).

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

166605222 is a wasteful number, since it uses less digits than its factorization.

166605222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3205.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 166605222 is about 12907.5645262768. The cubic root of 166605222 is about 550.2535712302.

The spelling of 166605222 in words is "one hundred sixty-six million, six hundred five thousand, two hundred twenty-two".