11556647755 has 24 divisors (see below), whose sum is σ = 14505411024. Its totient is φ = 8837808000.

The previous prime is 11556647699. The next prime is 11556647771. The reversal of 11556647755 is 55774665511.

11556647755 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11556647755 - 2¹⁵ = 11556614987 is a prime.

It is a super-2 number, since 2×11556647755² (a number of 21 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 411100 + ... + 438310.

It is an arithmetic number, because the mean of its divisors is an integer number (604392126).

Almost surely, 2^11556647755 is an apocalyptic number.

11556647755 is a deficient number, since it is larger than the sum of its proper divisors (2948763269).

11556647755 is a wasteful number, since it uses less digits than its factorization.

11556647755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27375 (or 27346 counting only the distinct ones).

The product of its digits is 4410000, while the sum is 52.

The spelling of 11556647755 in words is "eleven billion, five hundred fifty-six million, six hundred forty-seven thousand, seven hundred fifty-five".