81079822339 has 2 divisors, whose sum is σ = 81079822340. Its totient is φ = 81079822338.

The previous prime is 81079822331. The next prime is 81079822379. The reversal of 81079822339 is 93322897018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81079822339 - 2³ = 81079822331 is a prime.

It is not a weakly prime, because it can be changed into another prime (81079822331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539911169 + 40539911170.

It is an arithmetic number, because the mean of its divisors is an integer number (40539911170).

Almost surely, 2^81079822339 is an apocalyptic number.

81079822339 is a deficient number, since it is larger than the sum of its proper divisors (1).

81079822339 is an equidigital number, since it uses as much as digits as its factorization.

81079822339 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 81079822339 in words is "eighty-one billion, seventy-nine million, eight hundred twenty-two thousand, three hundred thirty-nine".