11112211211161 has 2 divisors, whose sum is σ = 11112211211162. Its totient is φ = 11112211211160.

The previous prime is 11112211211137. The next prime is 11112211211209. The reversal of 11112211211161 is 16111211221111.

11112211211161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a m-pointer prime, because the next prime (11112211211209) can be obtained adding 11112211211161 to its product of digits (48).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6742689895561 + 4369521315600 = 2596669^2 + 2090340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11112211211161 is a prime.

It is a super-3 number, since 3×11112211211161³ (a number of 40 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (11112211211261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5556105605580 + 5556105605581.

It is an arithmetic number, because the mean of its divisors is an integer number (5556105605581).

Almost surely, 2^{11112211211161} is an apocalyptic number.

It is an amenable number.

11112211211161 is a deficient number, since it is larger than the sum of its proper divisors (1).

11112211211161 is an equidigital number, since it uses as much as digits as its factorization.

11112211211161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 22.

Adding to 11112211211161 its reverse (16111211221111), we get a palindrome (27223422432272).

The spelling of 11112211211161 in words is "eleven trillion, one hundred twelve billion, two hundred eleven million, two hundred eleven thousand, one hundred sixty-one".