11143566261 has 12 divisors (see below), whose sum is σ = 16097346720. Its totient is φ = 7428543720.

The previous prime is 11143566241. The next prime is 11143566271. The reversal of 11143566261 is 16266534111.

11143566261 is a `hidden beast` number, since 11 + 14 + 3 + 5 + 6 + 626 + 1 = 666.

11143566261 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 11143566261 - 2⁹ = 11143565749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11143566241) 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 11 ways as a sum of consecutive naturals, for example, 141826 + ... + 205916.

It is an arithmetic number, because the mean of its divisors is an integer number (1341445560).

Almost surely, 2^11143566261 is an apocalyptic number.

It is an amenable number.

11143566261 is a deficient number, since it is larger than the sum of its proper divisors (4953780459).

11143566261 is a wasteful number, since it uses less digits than its factorization.

11143566261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83416 (or 83413 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The spelling of 11143566261 in words is "eleven billion, one hundred forty-three million, five hundred sixty-six thousand, two hundred sixty-one".