12115215517 has 2 divisors, whose sum is σ = 12115215518. Its totient is φ = 12115215516.

The previous prime is 12115215481. The next prime is 12115215533. The reversal of 12115215517 is 71551251121.

12115215517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12112983481 + 2232036 = 110059^2 + 1494^2 .

It is a cyclic number.

It is not a de Polignac number, because 12115215517 - 2²³ = 12106826909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12115215577) 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 as a sum of consecutive naturals, namely, 6057607758 + 6057607759.

It is an arithmetic number, because the mean of its divisors is an integer number (6057607759).

Almost surely, 2^12115215517 is an apocalyptic number.

It is an amenable number.

12115215517 is a deficient number, since it is larger than the sum of its proper divisors (1).

12115215517 is an equidigital number, since it uses as much as digits as its factorization.

12115215517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3500, while the sum is 31.

Adding to 12115215517 its reverse (71551251121), we get a palindrome (83666466638).

The spelling of 12115215517 in words is "twelve billion, one hundred fifteen million, two hundred fifteen thousand, five hundred seventeen".