166424441220 has 36 divisors (see below), whose sum is σ = 504820805580. Its totient is φ = 44379850944.

The previous prime is 166424441213. The next prime is 166424441257. The reversal of 166424441220 is 22144424661.

166424441220 is a `hidden beast` number, since 1 + 6 + 6 + 424 + 4 + 4 + 1 + 220 = 666.

166424441220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 53516344896 + 112908096324 = 231336^2 + 336018^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

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, 462289935 + ... + 462290294.

It is an arithmetic number, because the mean of its divisors is an integer number (14022800155).

Almost surely, 2^166424441220 is an apocalyptic number.

166424441220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166424441220 is an abundant number, since it is smaller than the sum of its proper divisors (338396364360).

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

166424441220 is a wasteful number, since it uses less digits than its factorization.

166424441220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924580244 (or 924580239 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 36.

Adding to 166424441220 its reverse (22144424661), we get a palindrome (188568865881).

It can be divided in two parts, 166424441 and 220, that added together give a palindrome (166424661).

The spelling of 166424441220 in words is "one hundred sixty-six billion, four hundred twenty-four million, four hundred forty-one thousand, two hundred twenty".