81769456843 has 2 divisors, whose sum is σ = 81769456844. Its totient is φ = 81769456842.

The previous prime is 81769456829. The next prime is 81769456933. The reversal of 81769456843 is 34865496718.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81769456843 - 2⁹ = 81769456331 is a prime.

It is not a weakly prime, because it can be changed into another prime (81769406843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40884728421 + 40884728422.

It is an arithmetic number, because the mean of its divisors is an integer number (40884728422).

Almost surely, 2^81769456843 is an apocalyptic number.

81769456843 is a deficient number, since it is larger than the sum of its proper divisors (1).

81769456843 is an equidigital number, since it uses as much as digits as its factorization.

81769456843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34836480, while the sum is 61.

The spelling of 81769456843 in words is "eighty-one billion, seven hundred sixty-nine million, four hundred fifty-six thousand, eight hundred forty-three".