11156661317 has 2 divisors, whose sum is σ = 11156661318. Its totient is φ = 11156661316.

The previous prime is 11156661287. The next prime is 11156661379. The reversal of 11156661317 is 71316665111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9225410401 + 1931250916 = 96049^2 + 43946^2 .

It is an emirp because it is prime and its reverse (71316665111) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11156661317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11156661017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5578330658 + 5578330659.

It is an arithmetic number, because the mean of its divisors is an integer number (5578330659).

Almost surely, 2^11156661317 is an apocalyptic number.

It is an amenable number.

11156661317 is a deficient number, since it is larger than the sum of its proper divisors (1).

11156661317 is an equidigital number, since it uses as much as digits as its factorization.

11156661317 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22680, while the sum is 38.

The spelling of 11156661317 in words is "eleven billion, one hundred fifty-six million, six hundred sixty-one thousand, three hundred seventeen".