11811318641 has 2 divisors, whose sum is σ = 11811318642. Its totient is φ = 11811318640.

The previous prime is 11811318637. The next prime is 11811318683. The reversal of 11811318641 is 14681311811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11811125041 + 193600 = 108679^2 + 440^2 .

It is a cyclic number.

It is not a de Polignac number, because 11811318641 - 2² = 11811318637 is a prime.

It is not a weakly prime, because it can be changed into another prime (11811318611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5905659320 + 5905659321.

It is an arithmetic number, because the mean of its divisors is an integer number (5905659321).

Almost surely, 2^11811318641 is an apocalyptic number.

It is an amenable number.

11811318641 is a deficient number, since it is larger than the sum of its proper divisors (1).

11811318641 is an equidigital number, since it uses as much as digits as its factorization.

11811318641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 35.

The spelling of 11811318641 in words is "eleven billion, eight hundred eleven million, three hundred eighteen thousand, six hundred forty-one".