166155211 has 2 divisors, whose sum is σ = 166155212. Its totient is φ = 166155210.

The previous prime is 166155203. The next prime is 166155259. The reversal of 166155211 is 112551661.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (112551661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166155211 - 2³ = 166155203 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 166155211.

It is not a weakly prime, because it can be changed into another prime (166155911) 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, 83077605 + 83077606.

It is an arithmetic number, because the mean of its divisors is an integer number (83077606).

Almost surely, 2^166155211 is an apocalyptic number.

166155211 is a deficient number, since it is larger than the sum of its proper divisors (1).

166155211 is an equidigital number, since it uses as much as digits as its factorization.

166155211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 28.

The square root of 166155211 is about 12890.1206743769. The cubic root of 166155211 is about 549.7577015373.

The spelling of 166155211 in words is "one hundred sixty-six million, one hundred fifty-five thousand, two hundred eleven".