166111212 has 12 divisors (see below), whose sum is σ = 387592856. Its totient is φ = 55370400.

The previous prime is 166111189. The next prime is 166111219. The reversal of 166111212 is 212111661.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (166111219) 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, 6921289 + ... + 6921312.

Almost surely, 2^166111212 is an apocalyptic number.

166111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166111212 is an abundant number, since it is smaller than the sum of its proper divisors (221481644).

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

166111212 is a wasteful number, since it uses less digits than its factorization.

166111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13842608 (or 13842606 counting only the distinct ones).

The product of its digits is 144, while the sum is 21.

The square root of 166111212 is about 12888.4138667254. The cubic root of 166111212 is about 549.7091707602.

Adding to 166111212 its reverse (212111661), we get a palindrome (378222873).

The spelling of 166111212 in words is "one hundred sixty-six million, one hundred eleven thousand, two hundred twelve".