11561887811317 has 2 divisors, whose sum is σ = 11561887811318. Its totient is φ = 11561887811316.

The previous prime is 11561887811311. The next prime is 11561887811339. The reversal of 11561887811317 is 71311878816511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10485427610641 + 1076460200676 = 3238121^2 + 1037526^2 .

It is a cyclic number.

It is not a de Polignac number, because 11561887811317 - 2¹⁹ = 11561887287029 is a prime.

It is a super-2 number, since 2×11561887811317² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11561887811311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5780943905658 + 5780943905659.

It is an arithmetic number, because the mean of its divisors is an integer number (5780943905659).

Almost surely, 2^{11561887811317} is an apocalyptic number.

It is an amenable number.

11561887811317 is a deficient number, since it is larger than the sum of its proper divisors (1).

11561887811317 is an equidigital number, since it uses as much as digits as its factorization.

11561887811317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2257920, while the sum is 58.

The spelling of 11561887811317 in words is "eleven trillion, five hundred sixty-one billion, eight hundred eighty-seven million, eight hundred eleven thousand, three hundred seventeen".