11811318881 has 2 divisors, whose sum is σ = 11811318882. Its totient is φ = 11811318880.

The previous prime is 11811318829. The next prime is 11811318899. The reversal of 11811318881 is 18881311811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11317768225 + 493550656 = 106385^2 + 22216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11811318881 is a prime.

It is a super-2 number, since 2×11811318881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11811318811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905659440 + 5905659441.

It is an arithmetic number, because the mean of its divisors is an integer number (5905659441).

Almost surely, 2^11811318881 is an apocalyptic number.

It is an amenable number.

11811318881 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811318881 is an equidigital number, since it uses as much as digits as its factorization.

11811318881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 41.

The spelling of 11811318881 in words is "eleven billion, eight hundred eleven million, three hundred eighteen thousand, eight hundred eighty-one".