81804310859 has 2 divisors, whose sum is σ = 81804310860. Its totient is φ = 81804310858.

The previous prime is 81804310843. The next prime is 81804310883. The reversal of 81804310859 is 95801340818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81804310859 - 2⁴ = 81804310843 is a prime.

It is not a weakly prime, because it can be changed into another prime (81804318859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40902155429 + 40902155430.

It is an arithmetic number, because the mean of its divisors is an integer number (40902155430).

Almost surely, 2^81804310859 is an apocalyptic number.

81804310859 is a deficient number, since it is larger than the sum of its proper divisors (1).

81804310859 is an equidigital number, since it uses as much as digits as its factorization.

81804310859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 81804310859 in words is "eighty-one billion, eight hundred four million, three hundred ten thousand, eight hundred fifty-nine".