11511518887 has 8 divisors (see below), whose sum is σ = 12656904192. Its totient is φ = 10382614200.

The previous prime is 11511518881. The next prime is 11511518939. The reversal of 11511518887 is 78881511511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11511518887 - 2¹¹ = 11511516839 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 (11511518881) 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 7 ways as a sum of consecutive naturals, for example, 4118689 + ... + 4121482.

It is an arithmetic number, because the mean of its divisors is an integer number (1582113024).

Almost surely, 2^11511518887 is an apocalyptic number.

11511518887 is a deficient number, since it is larger than the sum of its proper divisors (1145385305).

11511518887 is a wasteful number, since it uses less digits than its factorization.

11511518887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8240309.

The product of its digits is 89600, while the sum is 46.

The spelling of 11511518887 in words is "eleven billion, five hundred eleven million, five hundred eighteen thousand, eight hundred eighty-seven".