19843980899 has 2 divisors, whose sum is σ = 19843980900. Its totient is φ = 19843980898.

The previous prime is 19843980797. The next prime is 19843980913. The reversal of 19843980899 is 99808934891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 19843980899 - 2²⁸ = 19575545443 is a prime.

It is not a weakly prime, because it can be changed into another prime (19843950899) 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, 9921990449 + 9921990450.

It is an arithmetic number, because the mean of its divisors is an integer number (9921990450).

Almost surely, 2^19843980899 is an apocalyptic number.

19843980899 is a deficient number, since it is larger than the sum of its proper divisors (1).

19843980899 is an equidigital number, since it uses as much as digits as its factorization.

19843980899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40310784, while the sum is 68.

The spelling of 19843980899 in words is "nineteen billion, eight hundred forty-three million, nine hundred eighty thousand, eight hundred ninety-nine".