19728016361 has 2 divisors, whose sum is σ = 19728016362. Its totient is φ = 19728016360.

The previous prime is 19728016339. The next prime is 19728016391. The reversal of 19728016361 is 16361082791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11806126336 + 7921890025 = 108656^2 + 89005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19728016361 is a prime.

It is not a weakly prime, because it can be changed into another prime (19728016391) 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, 9864008180 + 9864008181.

It is an arithmetic number, because the mean of its divisors is an integer number (9864008181).

Almost surely, 2^19728016361 is an apocalyptic number.

It is an amenable number.

19728016361 is a deficient number, since it is larger than the sum of its proper divisors (1).

19728016361 is an equidigital number, since it uses as much as digits as its factorization.

19728016361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 19728016361 in words is "nineteen billion, seven hundred twenty-eight million, sixteen thousand, three hundred sixty-one".