11511122456 has 16 divisors (see below), whose sum is σ = 21585649200. Its totient is φ = 5754949344.

The previous prime is 11511122443. The next prime is 11511122471. The reversal of 11511122456 is 65422111511.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9101 + ... + 152003.

It is an arithmetic number, because the mean of its divisors is an integer number (1349103075).

Almost surely, 2^11511122456 is an apocalyptic number.

It is an amenable number.

11511122456 is a deficient number, since it is larger than the sum of its proper divisors (10074526744).

11511122456 is a wasteful number, since it uses less digits than its factorization.

11511122456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152978 (or 152974 counting only the distinct ones).

The product of its digits is 2400, while the sum is 29.

Adding to 11511122456 its reverse (65422111511), we get a palindrome (76933233967).

The spelling of 11511122456 in words is "eleven billion, five hundred eleven million, one hundred twenty-two thousand, four hundred fifty-six".