81364877848339 has 2 divisors, whose sum is σ = 81364877848340. Its totient is φ = 81364877848338.

The previous prime is 81364877848321. The next prime is 81364877848357. The reversal of 81364877848339 is 93384877846318.

It is a balanced prime because it is at equal distance from previous prime (81364877848321) and next prime (81364877848357).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81364877848339 is a prime.

It is not a weakly prime, because it can be changed into another prime (81364877848369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40682438924169 + 40682438924170.

It is an arithmetic number, because the mean of its divisors is an integer number (40682438924170).

Almost surely, 2^{81364877848339} is an apocalyptic number.

81364877848339 is a deficient number, since it is larger than the sum of its proper divisors (1).

81364877848339 is an equidigital number, since it uses as much as digits as its factorization.

81364877848339 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4682022912, while the sum is 79.

The spelling of 81364877848339 in words is "eighty-one trillion, three hundred sixty-four billion, eight hundred seventy-seven million, eight hundred forty-eight thousand, three hundred thirty-nine".