166143220 has 24 divisors (see below), whose sum is σ = 367264800. Its totient is φ = 62959392.

The previous prime is 166143179. The next prime is 166143221. The reversal of 166143220 is 22341661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166143221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 218230 + ... + 218989.

It is an arithmetic number, because the mean of its divisors is an integer number (15302700).

Almost surely, 2^166143220 is an apocalyptic number.

166143220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166143220 is an abundant number, since it is smaller than the sum of its proper divisors (201121580).

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

166143220 is a wasteful number, since it uses less digits than its factorization.

166143220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437247 (or 437245 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 166143220 is about 12889.6555423332. The cubic root of 166143220 is about 549.7444763464.

Adding to 166143220 its reverse (22341661), we get a palindrome (188484881).

The spelling of 166143220 in words is "one hundred sixty-six million, one hundred forty-three thousand, two hundred twenty".