19999668642271 has 2 divisors, whose sum is σ = 19999668642272. Its totient is φ = 19999668642270.

The previous prime is 19999668642211. The next prime is 19999668642281. The reversal of 19999668642271 is 17224686699991.

It is a strong prime.

It is an emirp because it is prime and its reverse (17224686699991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19999668642271 - 2¹⁹ = 19999668117983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19999668642191 and 19999668642200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19999668642211) 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, 9999834321135 + 9999834321136.

It is an arithmetic number, because the mean of its divisors is an integer number (9999834321136).

Almost surely, 2^{19999668642271} is an apocalyptic number.

19999668642271 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999668642271 is an equidigital number, since it uses as much as digits as its factorization.

19999668642271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1269789696, while the sum is 79.

The spelling of 19999668642271 in words is "nineteen trillion, nine hundred ninety-nine billion, six hundred sixty-eight million, six hundred forty-two thousand, two hundred seventy-one".