11515205617 has 2 divisors, whose sum is σ = 11515205618. Its totient is φ = 11515205616.

The previous prime is 11515205573. The next prime is 11515205621. The reversal of 11515205617 is 71650251511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8303036641 + 3212168976 = 91121^2 + 56676^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11515205617 is a prime.

It is not a weakly prime, because it can be changed into another prime (11515205627) 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 as a sum of consecutive naturals, namely, 5757602808 + 5757602809.

It is an arithmetic number, because the mean of its divisors is an integer number (5757602809).

Almost surely, 2^11515205617 is an apocalyptic number.

It is an amenable number.

11515205617 is a deficient number, since it is larger than the sum of its proper divisors (1).

11515205617 is an equidigital number, since it uses as much as digits as its factorization.

11515205617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10500, while the sum is 34.

The spelling of 11515205617 in words is "eleven billion, five hundred fifteen million, two hundred five thousand, six hundred seventeen".