11511642811 has 2 divisors, whose sum is σ = 11511642812. Its totient is φ = 11511642810.

The previous prime is 11511642809. The next prime is 11511642817. The reversal of 11511642811 is 11824611511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11511642811 - 2¹ = 11511642809 is a prime.

Together with 11511642809, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (11511642817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5755821405 + 5755821406.

It is an arithmetic number, because the mean of its divisors is an integer number (5755821406).

Almost surely, 2^11511642811 is an apocalyptic number.

11511642811 is a deficient number, since it is larger than the sum of its proper divisors (1).

11511642811 is an equidigital number, since it uses as much as digits as its factorization.

11511642811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920, while the sum is 31.

The spelling of 11511642811 in words is "eleven billion, five hundred eleven million, six hundred forty-two thousand, eight hundred eleven".