19168886249 has 2 divisors, whose sum is σ = 19168886250. Its totient is φ = 19168886248.

The previous prime is 19168886189. The next prime is 19168886287. The reversal of 19168886249 is 94268886191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15492283024 + 3676603225 = 124468^2 + 60635^2 .

It is an emirp because it is prime and its reverse (94268886191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19168886249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19168886191 and 19168886200.

It is not a weakly prime, because it can be changed into another prime (19168886749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9584443124 + 9584443125.

It is an arithmetic number, because the mean of its divisors is an integer number (9584443125).

Almost surely, 2^19168886249 is an apocalyptic number.

It is an amenable number.

19168886249 is a deficient number, since it is larger than the sum of its proper divisors (1).

19168886249 is an equidigital number, since it uses as much as digits as its factorization.

19168886249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 62.

The spelling of 19168886249 in words is "nineteen billion, one hundred sixty-eight million, eight hundred eighty-six thousand, two hundred forty-nine".