11222111161 has 2 divisors, whose sum is σ = 11222111162. Its totient is φ = 11222111160.

The previous prime is 11222111143. The next prime is 11222111183. The reversal of 11222111161 is 16111122211.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10667791225 + 554319936 = 103285^2 + 23544^2 .

It is a cyclic number.

It is not a de Polignac number, because 11222111161 - 2⁹ = 11222110649 is a prime.

It is not a weakly prime, because it can be changed into another prime (11222111561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5611055580 + 5611055581.

It is an arithmetic number, because the mean of its divisors is an integer number (5611055581).

Almost surely, 2^11222111161 is an apocalyptic number.

It is an amenable number.

11222111161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11222111161 is an equidigital number, since it uses as much as digits as its factorization.

11222111161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 19.

Adding to 11222111161 its reverse (16111122211), we get a palindrome (27333233372).

The spelling of 11222111161 in words is "eleven billion, two hundred twenty-two million, one hundred eleven thousand, one hundred sixty-one".