12115556611 has 2 divisors, whose sum is σ = 12115556612. Its totient is φ = 12115556610.

The previous prime is 12115556569. The next prime is 12115556639. The reversal of 12115556611 is 11665551121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12115556611 - 2⁷ = 12115556483 is a prime.

It is not a weakly prime, because it can be changed into another prime (12115556641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6057778305 + 6057778306.

It is an arithmetic number, because the mean of its divisors is an integer number (6057778306).

Almost surely, 2^12115556611 is an apocalyptic number.

12115556611 is a deficient number, since it is larger than the sum of its proper divisors (1).

12115556611 is an equidigital number, since it uses as much as digits as its factorization.

12115556611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9000, while the sum is 34.

The spelling of 12115556611 in words is "twelve billion, one hundred fifteen million, five hundred fifty-six thousand, six hundred eleven".