166222212 has 24 divisors (see below), whose sum is σ = 417686976. Its totient is φ = 51145248.

The previous prime is 166222187. The next prime is 166222247. The reversal of 166222212 is 212222661.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532608 + ... + 532919.

It is an arithmetic number, because the mean of its divisors is an integer number (17403624).

Almost surely, 2^166222212 is an apocalyptic number.

166222212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166222212 is an abundant number, since it is smaller than the sum of its proper divisors (251464764).

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

166222212 is a wasteful number, since it uses less digits than its factorization.

166222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065547 (or 1065545 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 166222212 is about 12892.7193407752. The cubic root of 166222212 is about 549.8315870038.

Adding to 166222212 its reverse (212222661), we get a palindrome (378444873).

The spelling of 166222212 in words is "one hundred sixty-six million, two hundred twenty-two thousand, two hundred twelve".