11556055505 has 4 divisors (see below), whose sum is σ = 13867266612. Its totient is φ = 9244844400.

The previous prime is 11556055471. The next prime is 11556055529. The reversal of 11556055505 is 50555065511.

It is a happy number.

11556055505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9230597776 + 2325457729 = 96076^2 + 48223^2 .

It is not a de Polignac number, because 11556055505 - 2⁸ = 11556055249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1155605546 + ... + 1155605555.

It is an arithmetic number, because the mean of its divisors is an integer number (3466816653).

Almost surely, 2^11556055505 is an apocalyptic number.

It is an amenable number.

11556055505 is a deficient number, since it is larger than the sum of its proper divisors (2311211107).

11556055505 is an equidigital number, since it uses as much as digits as its factorization.

11556055505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2311211106.

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 11556055505 in words is "eleven billion, five hundred fifty-six million, fifty-five thousand, five hundred five".