166381200 has 180 divisors, whose sum is σ = 583922820. Its totient is φ = 43868160.

The previous prime is 166381199. The next prime is 166381217. The reversal of 166381200 is 2183661.

166381200 is a `hidden beast` number, since 1 + 6 + 638 + 1 + 20 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 8225424 + 158155776 = 2868^2 + 12576^2 .

It is a tau number, because it is divible by the number of its divisors (180).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 406596 + ... + 407004.

Almost surely, 2^166381200 is an apocalyptic number.

166381200 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 166381200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291961410).

166381200 is an abundant number, since it is smaller than the sum of its proper divisors (417541620).

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

166381200 is a wasteful number, since it uses less digits than its factorization.

166381200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546 (or 532 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 166381200 is about 12898.8836726284. The cubic root of 166381200 is about 550.0068318711.

The spelling of 166381200 in words is "one hundred sixty-six million, three hundred eighty-one thousand, two hundred".