81328704366011 has 2 divisors, whose sum is σ = 81328704366012. Its totient is φ = 81328704366010.

The previous prime is 81328704365999. The next prime is 81328704366071. The reversal of 81328704366011 is 11066340782318.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81328704366011 is a prime.

It is a super-2 number, since 2×81328704366011² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81328704366071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40664352183005 + 40664352183006.

It is an arithmetic number, because the mean of its divisors is an integer number (40664352183006).

Almost surely, 2^{81328704366011} is an apocalyptic number.

81328704366011 is a deficient number, since it is larger than the sum of its proper divisors (1).

81328704366011 is an equidigital number, since it uses as much as digits as its factorization.

81328704366011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The spelling of 81328704366011 in words is "eighty-one trillion, three hundred twenty-eight billion, seven hundred four million, three hundred sixty-six thousand, eleven".