11511565051 has 12 divisors (see below), whose sum is σ = 13852764720. Its totient is φ = 9526811280.

The previous prime is 11511565007. The next prime is 11511565057. The reversal of 11511565051 is 15056511511.

It is a de Polignac number, because none of the positive numbers 2^k-11511565051 is a prime.

It is a super-2 number, since 2×11511565051² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11511565057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4049095 + ... + 4051936.

It is an arithmetic number, because the mean of its divisors is an integer number (1154397060).

Almost surely, 2^11511565051 is an apocalyptic number.

11511565051 is a deficient number, since it is larger than the sum of its proper divisors (2341199669).

11511565051 is an equidigital number, since it uses as much as digits as its factorization.

11511565051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8101074 (or 8101067 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 31.

The spelling of 11511565051 in words is "eleven billion, five hundred eleven million, five hundred sixty-five thousand, fifty-one".