166112218 has 4 divisors (see below), whose sum is σ = 249168330. Its totient is φ = 83056108.

The previous prime is 166112213. The next prime is 166112251. The reversal of 166112218 is 812211661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 812211661 = 271 ⋅2997091.

It can be written as a sum of positive squares in only one way, i.e., 87665769 + 78446449 = 9363^2 + 8857^2 .

It is not an unprimeable number, because it can be changed into a prime (166112213) 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 as a sum of consecutive naturals, namely, 41528053 + ... + 41528056.

Almost surely, 2^166112218 is an apocalyptic number.

166112218 is a deficient number, since it is larger than the sum of its proper divisors (83056112).

166112218 is an equidigital number, since it uses as much as digits as its factorization.

166112218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83056111.

The product of its digits is 1152, while the sum is 28.

The square root of 166112218 is about 12888.4528939668. The cubic root of 166112218 is about 549.7102804712.

Adding to 166112218 its reverse (812211661), we get a palindrome (978323879).

The spelling of 166112218 in words is "one hundred sixty-six million, one hundred twelve thousand, two hundred eighteen".