81364877846339 has 2 divisors, whose sum is σ = 81364877846340. Its totient is φ = 81364877846338.

The previous prime is 81364877846279. The next prime is 81364877846341. The reversal of 81364877846339 is 93364877846318.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81364877846339 - 2³⁶ = 81296158369603 is a prime.

Together with 81364877846341, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81364877846339.

It is not a weakly prime, because it can be changed into another prime (81364877848339) 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, 40682438923169 + 40682438923170.

It is an arithmetic number, because the mean of its divisors is an integer number (40682438923170).

Almost surely, 2^{81364877846339} is an apocalyptic number.

81364877846339 is a deficient number, since it is larger than the sum of its proper divisors (1).

81364877846339 is an equidigital number, since it uses as much as digits as its factorization.

81364877846339 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3511517184, while the sum is 77.

The spelling of 81364877846339 in words is "eighty-one trillion, three hundred sixty-four billion, eight hundred seventy-seven million, eight hundred forty-six thousand, three hundred thirty-nine".