20166220211 has 2 divisors, whose sum is σ = 20166220212. Its totient is φ = 20166220210.

The previous prime is 20166220183. The next prime is 20166220259. The reversal of 20166220211 is 11202266102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20166220211 - 2⁶ = 20166220147 is a prime.

It is not a weakly prime, because it can be changed into another prime (20166222211) 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, 10083110105 + 10083110106.

It is an arithmetic number, because the mean of its divisors is an integer number (10083110106).

Almost surely, 2^20166220211 is an apocalyptic number.

20166220211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20166220211 is an equidigital number, since it uses as much as digits as its factorization.

20166220211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 20166220211 its reverse (11202266102), we get a palindrome (31368486313).

The spelling of 20166220211 in words is "twenty billion, one hundred sixty-six million, two hundred twenty thousand, two hundred eleven".