81073593563 has 2 divisors, whose sum is σ = 81073593564. Its totient is φ = 81073593562.

The previous prime is 81073593439. The next prime is 81073593581. The reversal of 81073593563 is 36539537018.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81073593563 - 2²⁸ = 80805158107 is a prime.

It is not a weakly prime, because it can be changed into another prime (81073553563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40536796781 + 40536796782.

It is an arithmetic number, because the mean of its divisors is an integer number (40536796782).

Almost surely, 2^81073593563 is an apocalyptic number.

81073593563 is a deficient number, since it is larger than the sum of its proper divisors (1).

81073593563 is an equidigital number, since it uses as much as digits as its factorization.

81073593563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 50.

The spelling of 81073593563 in words is "eighty-one billion, seventy-three million, five hundred ninety-three thousand, five hundred sixty-three".