81079822319 has 2 divisors, whose sum is σ = 81079822320. Its totient is φ = 81079822318.

The previous prime is 81079822303. The next prime is 81079822331. The reversal of 81079822319 is 91322897018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81079822319 - 2⁴ = 81079822303 is a prime.

It is a super-2 number, since 2×81079822319² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81079822339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40539911159 + 40539911160.

It is an arithmetic number, because the mean of its divisors is an integer number (40539911160).

Almost surely, 2^81079822319 is an apocalyptic number.

81079822319 is a deficient number, since it is larger than the sum of its proper divisors (1).

81079822319 is an equidigital number, since it uses as much as digits as its factorization.

81079822319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 50.

The spelling of 81079822319 in words is "eighty-one billion, seventy-nine million, eight hundred twenty-two thousand, three hundred nineteen".