11511642818 has 16 divisors (see below), whose sum is σ = 18766338360. Its totient is φ = 5264320896.

The previous prime is 11511642817. The next prime is 11511642823. The reversal of 11511642818 is 81824611511.

11511642818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 5372450209 + 6139192609 = 73297^2 + 78353^2 .

It is a super-2 number, since 2×11511642818² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11511642811) 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 in 7 ways as a sum of consecutive naturals, for example, 2028155 + ... + 2033822.

Almost surely, 2^11511642818 is an apocalyptic number.

11511642818 is a deficient number, since it is larger than the sum of its proper divisors (7254695542).

11511642818 is a wasteful number, since it uses less digits than its factorization.

11511642818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4062101.

The product of its digits is 15360, while the sum is 38.

The spelling of 11511642818 in words is "eleven billion, five hundred eleven million, six hundred forty-two thousand, eight hundred eighteen".