11915318687 has 4 divisors (see below), whose sum is σ = 11931185376. Its totient is φ = 11899452000.

The previous prime is 11915318677. The next prime is 11915318713. The reversal of 11915318687 is 78681351911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78681351911 = 3301 ⋅23835611.

It is a cyclic number.

It is not a de Polignac number, because 11915318687 - 2⁴ = 11915318671 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 (11915318677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7932218 + ... + 7933719.

It is an arithmetic number, because the mean of its divisors is an integer number (2982796344).

Almost surely, 2^11915318687 is an apocalyptic number.

11915318687 is a deficient number, since it is larger than the sum of its proper divisors (15866689).

11915318687 is an equidigital number, since it uses as much as digits as its factorization.

11915318687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15866688.

The product of its digits is 362880, while the sum is 50.

The spelling of 11915318687 in words is "eleven billion, nine hundred fifteen million, three hundred eighteen thousand, six hundred eighty-seven".