166422444 has 72 divisors (see below), whose sum is σ = 420276528. Its totient is φ = 51217920.

The previous prime is 166422433. The next prime is 166422449. The reversal of 166422444 is 444224661.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (166422449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177144 + ... + 178080.

It is an arithmetic number, because the mean of its divisors is an integer number (5837174).

Almost surely, 2^166422444 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166422444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210138264).

166422444 is an abundant number, since it is smaller than the sum of its proper divisors (253854084).

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

166422444 is a wasteful number, since it uses less digits than its factorization.

166422444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023 (or 1002 counting only the distinct ones).

The product of its digits is 36864, while the sum is 33.

The square root of 166422444 is about 12900.4823165648. The cubic root of 166422444 is about 550.0522749212.

The spelling of 166422444 in words is "one hundred sixty-six million, four hundred twenty-two thousand, four hundred forty-four".