11565225509 has 2 divisors, whose sum is σ = 11565225510. Its totient is φ = 11565225508.

The previous prime is 11565225473. The next prime is 11565225523. The reversal of 11565225509 is 90552256511.

11565225509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10270809025 + 1294416484 = 101345^2 + 35978^2 .

It is an emirp because it is prime and its reverse (90552256511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11565225509 - 2¹² = 11565221413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11565225809) 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 as a sum of consecutive naturals, namely, 5782612754 + 5782612755.

It is an arithmetic number, because the mean of its divisors is an integer number (5782612755).

Almost surely, 2^11565225509 is an apocalyptic number.

It is an amenable number.

11565225509 is a deficient number, since it is larger than the sum of its proper divisors (1).

11565225509 is an equidigital number, since it uses as much as digits as its factorization.

11565225509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 135000, while the sum is 41.

The spelling of 11565225509 in words is "eleven billion, five hundred sixty-five million, two hundred twenty-five thousand, five hundred nine".