81364877846279 has 2 divisors, whose sum is σ = 81364877846280. Its totient is φ = 81364877846278.

The previous prime is 81364877846249. The next prime is 81364877846339. The reversal of 81364877846279 is 97264877846318.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81364877846279 - 2⁸ = 81364877846023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81364877846249) 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, 40682438923139 + 40682438923140.

It is an arithmetic number, because the mean of its divisors is an integer number (40682438923140).

Almost surely, 2^{81364877846279} is an apocalyptic number.

81364877846279 is a deficient number, since it is larger than the sum of its proper divisors (1).

81364877846279 is an equidigital number, since it uses as much as digits as its factorization.

81364877846279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5462360064, while the sum is 80.

The spelling of 81364877846279 in words is "eighty-one trillion, three hundred sixty-four billion, eight hundred seventy-seven million, eight hundred forty-six thousand, two hundred seventy-nine".