166644820 has 36 divisors (see below), whose sum is σ = 369358164. Its totient is φ = 63146880.

The previous prime is 166644811. The next prime is 166644847. The reversal of 166644820 is 28446661.

It can be written as a sum of positive squares in 2 ways, for example, as 70526404 + 96118416 = 8398^2 + 9804^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 166644820.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4321 + ... + 18760.

It is an arithmetic number, because the mean of its divisors is an integer number (10259949).

Almost surely, 2^166644820 is an apocalyptic number.

166644820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166644820 is an abundant number, since it is smaller than the sum of its proper divisors (202713344).

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

166644820 is a wasteful number, since it uses less digits than its factorization.

166644820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23128 (or 23107 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 166644820 is about 12909.0983418673. The cubic root of 166644820 is about 550.2971617304.

The spelling of 166644820 in words is "one hundred sixty-six million, six hundred forty-four thousand, eight hundred twenty".