81116439611 has 2 divisors, whose sum is σ = 81116439612. Its totient is φ = 81116439610.

The previous prime is 81116439587. The next prime is 81116439637. The reversal of 81116439611 is 11693461118.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81116439611 is a prime.

It is not a weakly prime, because it can be changed into another prime (81116433611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40558219805 + 40558219806.

It is an arithmetic number, because the mean of its divisors is an integer number (40558219806).

Almost surely, 2^81116439611 is an apocalyptic number.

81116439611 is a deficient number, since it is larger than the sum of its proper divisors (1).

81116439611 is an equidigital number, since it uses as much as digits as its factorization.

81116439611 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The spelling of 81116439611 in words is "eighty-one billion, one hundred sixteen million, four hundred thirty-nine thousand, six hundred eleven".