11155555111 has 2 divisors, whose sum is σ = 11155555112. Its totient is φ = 11155555110.

The previous prime is 11155555109. The next prime is 11155555129.

11155555111 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 11155555111 - 2¹ = 11155555109 is a prime.

Together with 11155555109, it forms a pair of twin primes.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11155555171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5577777555 + 5577777556.

It is an arithmetic number, because the mean of its divisors is an integer number (5577777556).

Almost surely, 2^11155555111 is an apocalyptic number.

11155555111 is a deficient number, since it is larger than the sum of its proper divisors (1).

11155555111 is an equidigital number, since it uses as much as digits as its factorization.

11155555111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3125, while the sum is 31.

The spelling of 11155555111 in words is "eleven billion, one hundred fifty-five million, five hundred fifty-five thousand, one hundred eleven".