81343510793 has 2 divisors, whose sum is σ = 81343510794. Its totient is φ = 81343510792.

The previous prime is 81343510757. The next prime is 81343510813. The reversal of 81343510793 is 39701534318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69977179024 + 11366331769 = 264532^2 + 106613^2 .

It is a cyclic number.

It is not a de Polignac number, because 81343510793 - 2²⁶ = 81276401929 is a prime.

It is not a weakly prime, because it can be changed into another prime (81343510093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40671755396 + 40671755397.

It is an arithmetic number, because the mean of its divisors is an integer number (40671755397).

Almost surely, 2^81343510793 is an apocalyptic number.

It is an amenable number.

81343510793 is a deficient number, since it is larger than the sum of its proper divisors (1).

81343510793 is an equidigital number, since it uses as much as digits as its factorization.

81343510793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 81343510793 in words is "eighty-one billion, three hundred forty-three million, five hundred ten thousand, seven hundred ninety-three".