11511565055 has 8 divisors (see below), whose sum is σ = 14540924400. Its totient is φ = 8724554496.

The previous prime is 11511565007. The next prime is 11511565057. The reversal of 11511565055 is 55056511511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11511565055 is a prime.

It is a super-2 number, since 2×11511565055² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60587090 + ... + 60587279.

It is an arithmetic number, because the mean of its divisors is an integer number (1817615550).

Almost surely, 2^11511565055 is an apocalyptic number.

11511565055 is a deficient number, since it is larger than the sum of its proper divisors (3029359345).

11511565055 is a wasteful number, since it uses less digits than its factorization.

11511565055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121174393.

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 11511565055 in words is "eleven billion, five hundred eleven million, five hundred sixty-five thousand, fifty-five".