19784368489 has 2 divisors, whose sum is σ = 19784368490. Its totient is φ = 19784368488.

The previous prime is 19784368453. The next prime is 19784368523. The reversal of 19784368489 is 98486348791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19241851225 + 542517264 = 138715^2 + 23292^2 .

It is a cyclic number.

It is not a de Polignac number, because 19784368489 - 2³¹ = 17636884841 is a prime.

It is a super-2 number, since 2×19784368489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (19784368589) 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, 9892184244 + 9892184245.

It is an arithmetic number, because the mean of its divisors is an integer number (9892184245).

Almost surely, 2^19784368489 is an apocalyptic number.

It is an amenable number.

19784368489 is a deficient number, since it is larger than the sum of its proper divisors (1).

19784368489 is an equidigital number, since it uses as much as digits as its factorization.

19784368489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 83607552, while the sum is 67.

The spelling of 19784368489 in words is "nineteen billion, seven hundred eighty-four million, three hundred sixty-eight thousand, four hundred eighty-nine".