19983939715601 has 2 divisors, whose sum is σ = 19983939715602. Its totient is φ = 19983939715600.

The previous prime is 19983939715589. The next prime is 19983939715609. The reversal of 19983939715601 is 10651793938991.

It is a Cunningham number, because it is equal to 4470340²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19983939715600 + 1 = 4470340^2 + 1^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19983939715601 is a prime.

It is not a weakly prime, because it can be changed into another prime (19983939715609) 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, 9991969857800 + 9991969857801.

It is an arithmetic number, because the mean of its divisors is an integer number (9991969857801).

Almost surely, 2^{19983939715601} is an apocalyptic number.

It is an amenable number.

19983939715601 is a deficient number, since it is larger than the sum of its proper divisors (1).

19983939715601 is an equidigital number, since it uses as much as digits as its factorization.

19983939715601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 99202320, while the sum is 71.

The spelling of 19983939715601 in words is "nineteen trillion, nine hundred eighty-three billion, nine hundred thirty-nine million, seven hundred fifteen thousand, six hundred one".