11555091555 has 96 divisors (see below), whose sum is σ = 22581586944. Its totient is φ = 5021178624.

The previous prime is 11555091553. The next prime is 11555091631. The reversal of 11555091555 is 55519055511.

11555091555 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 11555091555 - 2¹ = 11555091553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11555091553) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 2821089 + ... + 2825181.

It is an arithmetic number, because the mean of its divisors is an integer number (235224864).

Almost surely, 2^11555091555 is an apocalyptic number.

11555091555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11555091555 is a deficient number, since it is larger than the sum of its proper divisors (11026495389).

11555091555 is a wasteful number, since it uses less digits than its factorization.

11555091555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4305 (or 4298 counting only the distinct ones).

The product of its (nonzero) digits is 140625, while the sum is 42.

The spelling of 11555091555 in words is "eleven billion, five hundred fifty-five million, ninety-one thousand, five hundred fifty-five".