81033583289497 has 2 divisors, whose sum is σ = 81033583289498. Its totient is φ = 81033583289496.

The previous prime is 81033583289459. The next prime is 81033583289501. The reversal of 81033583289497 is 79498238533018.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62130401056656 + 18903182232841 = 7882284^2 + 4347779^2 .

It is a cyclic number.

It is not a de Polignac number, because 81033583289497 - 2¹⁹ = 81033582765209 is a prime.

It is not a weakly prime, because it can be changed into another prime (81033583289437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40516791644748 + 40516791644749.

It is an arithmetic number, because the mean of its divisors is an integer number (40516791644749).

Almost surely, 2^{81033583289497} is an apocalyptic number.

It is an amenable number.

81033583289497 is a deficient number, since it is larger than the sum of its proper divisors (1).

81033583289497 is an equidigital number, since it uses as much as digits as its factorization.

81033583289497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 313528320, while the sum is 70.

The spelling of 81033583289497 in words is "eighty-one trillion, thirty-three billion, five hundred eighty-three million, two hundred eighty-nine thousand, four hundred ninety-seven".