19983942242837 has 2 divisors, whose sum is σ = 19983942242838. Its totient is φ = 19983942242836.

The previous prime is 19983942242833. The next prime is 19983942242909. The reversal of 19983942242837 is 73824224938991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18639476483716 + 1344465759121 = 4317346^2 + 1159511^2 .

It is a cyclic number.

It is not a de Polignac number, because 19983942242837 - 2² = 19983942242833 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19983942242833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9991971121418 + 9991971121419.

It is an arithmetic number, because the mean of its divisors is an integer number (9991971121419).

Almost surely, 2^{19983942242837} is an apocalyptic number.

It is an amenable number.

19983942242837 is a deficient number, since it is larger than the sum of its proper divisors (1).

19983942242837 is an equidigital number, since it uses as much as digits as its factorization.

19983942242837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 376233984, while the sum is 71.

The spelling of 19983942242837 in words is "nineteen trillion, nine hundred eighty-three billion, nine hundred forty-two million, two hundred forty-two thousand, eight hundred thirty-seven".