11515161611215 has 32 divisors (see below), whose sum is σ = 14008347360000. Its totient is φ = 9086232207360.

The previous prime is 11515161611153. The next prime is 11515161611221. The reversal of 11515161611215 is 51211616151511.

It is not a de Polignac number, because 11515161611215 - 2²¹ = 11515159514063 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133855786 + ... + 133941784.

It is an arithmetic number, because the mean of its divisors is an integer number (437760855000).

Almost surely, 2^{11515161611215} is an apocalyptic number.

11515161611215 is a deficient number, since it is larger than the sum of its proper divisors (2493185748785).

11515161611215 is a wasteful number, since it uses less digits than its factorization.

11515161611215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87267.

The product of its digits is 9000, while the sum is 37.

Adding to 11515161611215 its reverse (51211616151511), we get a palindrome (62726777762726).

The spelling of 11515161611215 in words is "eleven trillion, five hundred fifteen billion, one hundred sixty-one million, six hundred eleven thousand, two hundred fifteen".