81648080593 has 2 divisors, whose sum is σ = 81648080594. Its totient is φ = 81648080592.

The previous prime is 81648080551. The next prime is 81648080599. The reversal of 81648080593 is 39508084618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77758437904 + 3889642689 = 278852^2 + 62367^2 .

It is a cyclic number.

It is not a de Polignac number, because 81648080593 - 2⁹ = 81648080081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81648080593.

It is not a weakly prime, because it can be changed into another prime (81648080599) 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, 40824040296 + 40824040297.

It is an arithmetic number, because the mean of its divisors is an integer number (40824040297).

Almost surely, 2^81648080593 is an apocalyptic number.

It is an amenable number.

81648080593 is a deficient number, since it is larger than the sum of its proper divisors (1).

81648080593 is an equidigital number, since it uses as much as digits as its factorization.

81648080593 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 81648080593 in words is "eighty-one billion, six hundred forty-eight million, eighty thousand, five hundred ninety-three".