11055605561 has 48 divisors (see below), whose sum is σ = 15137791872. Its totient is φ = 7855626240.

The previous prime is 11055605537. The next prime is 11055605579. The reversal of 11055605561 is 16550655011.

It is a de Polignac number, because none of the positive numbers 2^k-11055605561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11055605531) 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 47 ways as a sum of consecutive naturals, for example, 907865 + ... + 919961.

It is an arithmetic number, because the mean of its divisors is an integer number (315370664).

Almost surely, 2^11055605561 is an apocalyptic number.

11055605561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11055605561 is a deficient number, since it is larger than the sum of its proper divisors (4082186311).

11055605561 is a wasteful number, since it uses less digits than its factorization.

11055605561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12222 (or 12211 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 35.

It can be divided in two parts, 11055 and 605561, that added together give a palindrome (616616).

The spelling of 11055605561 in words is "eleven billion, fifty-five million, six hundred five thousand, five hundred sixty-one".