166217222 has 8 divisors (see below), whose sum is σ = 254030256. Its totient is φ = 81540472.

The previous prime is 166217221. The next prime is 166217243. The reversal of 166217222 is 222712661.

It is a happy number.

166217222 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166217221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 783938 + ... + 784149.

It is an arithmetic number, because the mean of its divisors is an integer number (31753782).

Almost surely, 2^166217222 is an apocalyptic number.

166217222 is a deficient number, since it is larger than the sum of its proper divisors (87813034).

166217222 is a wasteful number, since it uses less digits than its factorization.

166217222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568142.

The product of its digits is 4032, while the sum is 29.

The square root of 166217222 is about 12892.5258192489. The cubic root of 166217222 is about 549.8260849572.

Adding to 166217222 its reverse (222712661), we get a palindrome (388929883).

The spelling of 166217222 in words is "one hundred sixty-six million, two hundred seventeen thousand, two hundred twenty-two".