81824017999 has 2 divisors, whose sum is σ = 81824018000. Its totient is φ = 81824017998.

The previous prime is 81824017939. The next prime is 81824018051. The reversal of 81824017999 is 99971042818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81824017999 - 2¹⁵ = 81823985231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81824017939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40912008999 + 40912009000.

It is an arithmetic number, because the mean of its divisors is an integer number (40912009000).

Almost surely, 2^81824017999 is an apocalyptic number.

81824017999 is a deficient number, since it is larger than the sum of its proper divisors (1).

81824017999 is an equidigital number, since it uses as much as digits as its factorization.

81824017999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 58.

The spelling of 81824017999 in words is "eighty-one billion, eight hundred twenty-four million, seventeen thousand, nine hundred ninety-nine".