166321836 has 72 divisors (see below), whose sum is σ = 439530000. Its totient is φ = 54991872.

The previous prime is 166321817. The next prime is 166321849. The reversal of 166321836 is 638123661.

166321836 is a `hidden beast` number, since 1 + 6 + 632 + 18 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 166321836.

It is an unprimeable number.

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, 132540 + ... + 133788.

Almost surely, 2^166321836 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 166321836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219765000).

166321836 is an abundant number, since it is smaller than the sum of its proper divisors (273208164).

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

166321836 is a wasteful number, since it uses less digits than its factorization.

166321836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405 (or 1391 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 166321836 is about 12896.5823379685. The cubic root of 166321836 is about 549.9414108389.

The spelling of 166321836 in words is "one hundred sixty-six million, three hundred twenty-one thousand, eight hundred thirty-six".