19968586919 has 2 divisors, whose sum is σ = 19968586920. Its totient is φ = 19968586918.

The previous prime is 19968586909. The next prime is 19968586969. The reversal of 19968586919 is 91968586991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19968586919 - 2⁸ = 19968586663 is a prime.

It is a super-2 number, since 2×19968586919² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19968586909) 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, 9984293459 + 9984293460.

It is an arithmetic number, because the mean of its divisors is an integer number (9984293460).

Almost surely, 2^19968586919 is an apocalyptic number.

19968586919 is a deficient number, since it is larger than the sum of its proper divisors (1).

19968586919 is an equidigital number, since it uses as much as digits as its factorization.

19968586919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75582720, while the sum is 71.

The spelling of 19968586919 in words is "nineteen billion, nine hundred sixty-eight million, five hundred eighty-six thousand, nine hundred nineteen".