19805744210719 has 2 divisors, whose sum is σ = 19805744210720. Its totient is φ = 19805744210718.

The previous prime is 19805744210699. The next prime is 19805744210761. The reversal of 19805744210719 is 91701244750891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19805744210719 - 2⁵ = 19805744210687 is a prime.

It is a super-2 number, since 2×19805744210719² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19805744210789) 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, 9902872105359 + 9902872105360.

It is an arithmetic number, because the mean of its divisors is an integer number (9902872105360).

Almost surely, 2^{19805744210719} is an apocalyptic number.

19805744210719 is a deficient number, since it is larger than the sum of its proper divisors (1).

19805744210719 is an equidigital number, since it uses as much as digits as its factorization.

19805744210719 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5080320, while the sum is 58.

The spelling of 19805744210719 in words is "nineteen trillion, eight hundred five billion, seven hundred forty-four million, two hundred ten thousand, seven hundred nineteen".