19816852070401 has 2 divisors, whose sum is σ = 19816852070402. Its totient is φ = 19816852070400.

The previous prime is 19816852070377. The next prime is 19816852070441. The reversal of 19816852070401 is 10407025861891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18739721523600 + 1077130546801 = 4328940^2 + 1037849^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19816852070401 is a prime.

It is not a weakly prime, because it can be changed into another prime (19816852070441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9908426035200 + 9908426035201.

It is an arithmetic number, because the mean of its divisors is an integer number (9908426035201).

Almost surely, 2^{19816852070401} is an apocalyptic number.

It is an amenable number.

19816852070401 is a deficient number, since it is larger than the sum of its proper divisors (1).

19816852070401 is an equidigital number, since it uses as much as digits as its factorization.

19816852070401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 967680, while the sum is 52.

The spelling of 19816852070401 in words is "nineteen trillion, eight hundred sixteen billion, eight hundred fifty-two million, seventy thousand, four hundred one".