11565505249 has 2 divisors, whose sum is σ = 11565505250. Its totient is φ = 11565505248.

The previous prime is 11565505243. The next prime is 11565505291. The reversal of 11565505249 is 94250556511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11278440000 + 287065249 = 106200^2 + 16943^2 .

It is a cyclic number.

It is not a de Polignac number, because 11565505249 - 2³ = 11565505241 is a prime.

It is not a weakly prime, because it can be changed into another prime (11565505241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5782752624 + 5782752625.

It is an arithmetic number, because the mean of its divisors is an integer number (5782752625).

Almost surely, 2^11565505249 is an apocalyptic number.

It is an amenable number.

11565505249 is a deficient number, since it is larger than the sum of its proper divisors (1).

11565505249 is an equidigital number, since it uses as much as digits as its factorization.

11565505249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 11565505249 in words is "eleven billion, five hundred sixty-five million, five hundred five thousand, two hundred forty-nine".