81408733559 has 2 divisors, whose sum is σ = 81408733560. Its totient is φ = 81408733558.

The previous prime is 81408733531. The next prime is 81408733579. The reversal of 81408733559 is 95533780418.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81408733559 - 2²⁸ = 81140298103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81408733559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81408733579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40704366779 + 40704366780.

It is an arithmetic number, because the mean of its divisors is an integer number (40704366780).

Almost surely, 2^81408733559 is an apocalyptic number.

81408733559 is a deficient number, since it is larger than the sum of its proper divisors (1).

81408733559 is an equidigital number, since it uses as much as digits as its factorization.

81408733559 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 81408733559 in words is "eighty-one billion, four hundred eight million, seven hundred thirty-three thousand, five hundred fifty-nine".