166143227 has 4 divisors (see below), whose sum is σ = 175916376. Its totient is φ = 156370080.

The previous prime is 166143221. The next prime is 166143259. The reversal of 166143227 is 722341661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 722341661 = 59 ⋅12243079.

It is not a de Polignac number, because 166143227 - 2¹⁰ = 166142203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166143193 and 166143202.

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

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 3 ways as a sum of consecutive naturals, for example, 4886549 + ... + 4886582.

It is an arithmetic number, because the mean of its divisors is an integer number (43979094).

Almost surely, 2^166143227 is an apocalyptic number.

166143227 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

166143227 is a deficient number, since it is larger than the sum of its proper divisors (9773149).

166143227 is an equidigital number, since it uses as much as digits as its factorization.

166143227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9773148.

The product of its digits is 12096, while the sum is 32.

The square root of 166143227 is about 12889.6558138687. The cubic root of 166143227 is about 549.7444840670.

Adding to 166143227 its reverse (722341661), we get a palindrome (888484888).

The spelling of 166143227 in words is "one hundred sixty-six million, one hundred forty-three thousand, two hundred twenty-seven".