11565505517 has 2 divisors, whose sum is σ = 11565505518. Its totient is φ = 11565505516.

The previous prime is 11565505499. The next prime is 11565505529. The reversal of 11565505517 is 71550556511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11518870276 + 46635241 = 107326^2 + 6829^2 .

It is a cyclic number.

It is not a de Polignac number, because 11565505517 - 2¹⁸ = 11565243373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11565505537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5782752758 + 5782752759.

It is an arithmetic number, because the mean of its divisors is an integer number (5782752759).

Almost surely, 2^11565505517 is an apocalyptic number.

It is an amenable number.

11565505517 is a deficient number, since it is larger than the sum of its proper divisors (1).

11565505517 is an equidigital number, since it uses as much as digits as its factorization.

11565505517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131250, while the sum is 41.

The spelling of 11565505517 in words is "eleven billion, five hundred sixty-five million, five hundred five thousand, five hundred seventeen".