12115553111 has 4 divisors (see below), whose sum is σ = 12116334912. Its totient is φ = 12114771312.

The previous prime is 12115553069. The next prime is 12115553123. The reversal of 12115553111 is 11135551121.

It is a happy number.

12115553111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12115553111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12115553141) 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 in 3 ways as a sum of consecutive naturals, for example, 367175 + ... + 398808.

It is an arithmetic number, because the mean of its divisors is an integer number (3029083728).

Almost surely, 2^12115553111 is an apocalyptic number.

12115553111 is a deficient number, since it is larger than the sum of its proper divisors (781801).

12115553111 is an equidigital number, since it uses as much as digits as its factorization.

12115553111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781800.

The product of its digits is 750, while the sum is 26.

The spelling of 12115553111 in words is "twelve billion, one hundred fifteen million, five hundred fifty-three thousand, one hundred eleven".