81818433443 has 2 divisors, whose sum is σ = 81818433444. Its totient is φ = 81818433442.

The previous prime is 81818433379. The next prime is 81818433457. The reversal of 81818433443 is 34433481818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81818433443 - 2⁶ = 81818433379 is a prime.

It is not a weakly prime, because it can be changed into another prime (81818433043) 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, 40909216721 + 40909216722.

It is an arithmetic number, because the mean of its divisors is an integer number (40909216722).

Almost surely, 2^81818433443 is an apocalyptic number.

81818433443 is a deficient number, since it is larger than the sum of its proper divisors (1).

81818433443 is an equidigital number, since it uses as much as digits as its factorization.

81818433443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 884736, while the sum is 47.

The spelling of 81818433443 in words is "eighty-one billion, eight hundred eighteen million, four hundred thirty-three thousand, four hundred forty-three".