11511578851 has 4 divisors (see below), whose sum is σ = 11595605112. Its totient is φ = 11427552592.

The previous prime is 11511578839. The next prime is 11511578857. The reversal of 11511578851 is 15887511511.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11511578851 - 2³¹ = 9364095203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11511578798 and 11511578807.

It is not an unprimeable number, because it can be changed into a prime (11511578857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42012925 + ... + 42013198.

It is an arithmetic number, because the mean of its divisors is an integer number (2898901278).

Almost surely, 2^11511578851 is an apocalyptic number.

11511578851 is a deficient number, since it is larger than the sum of its proper divisors (84026261).

11511578851 is an equidigital number, since it uses as much as digits as its factorization.

11511578851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84026260.

The product of its digits is 56000, while the sum is 43.

The spelling of 11511578851 in words is "eleven billion, five hundred eleven million, five hundred seventy-eight thousand, eight hundred fifty-one".