166222117 has 2 divisors, whose sum is σ = 166222118. Its totient is φ = 166222116.

The previous prime is 166222087. The next prime is 166222153. The reversal of 166222117 is 711222661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156525121 + 9696996 = 12511^2 + 3114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166222117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166222187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83111058 + 83111059.

It is an arithmetic number, because the mean of its divisors is an integer number (83111059).

Almost surely, 2^166222117 is an apocalyptic number.

It is an amenable number.

166222117 is a deficient number, since it is larger than the sum of its proper divisors (1).

166222117 is an equidigital number, since it uses as much as digits as its factorization.

166222117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 166222117 is about 12892.7156565248. The cubic root of 166222117 is about 549.8314822564.

Adding to 166222117 its reverse (711222661), we get a palindrome (877444778).

The spelling of 166222117 in words is "one hundred sixty-six million, two hundred twenty-two thousand, one hundred seventeen".