19983842241817 has 2 divisors, whose sum is σ = 19983842241818. Its totient is φ = 19983842241816.

The previous prime is 19983842241791. The next prime is 19983842241821. The reversal of 19983842241817 is 71814224838991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19015844032656 + 967998209161 = 4360716^2 + 983869^2 .

It is an emirp because it is prime and its reverse (71814224838991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19983842241817 - 2⁷ = 19983842241689 is a prime.

It is a super-2 number, since 2×19983842241817² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19983842245817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9991921120908 + 9991921120909.

It is an arithmetic number, because the mean of its divisors is an integer number (9991921120909).

Almost surely, 2^{19983842241817} is an apocalyptic number.

It is an amenable number.

19983842241817 is a deficient number, since it is larger than the sum of its proper divisors (1).

19983842241817 is an equidigital number, since it uses as much as digits as its factorization.

19983842241817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55738368, while the sum is 67.

The spelling of 19983842241817 in words is "nineteen trillion, nine hundred eighty-three billion, eight hundred forty-two million, two hundred forty-one thousand, eight hundred seventeen".