19998236099 has 2 divisors, whose sum is σ = 19998236100. Its totient is φ = 19998236098.

The previous prime is 19998236081. The next prime is 19998236101. The reversal of 19998236099 is 99063289991.

It is a strong prime.

It is an emirp because it is prime and its reverse (99063289991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19998236099 - 2⁸ = 19998235843 is a prime.

Together with 19998236101, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (19998230099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999118049 + 9999118050.

It is an arithmetic number, because the mean of its divisors is an integer number (9999118050).

Almost surely, 2^19998236099 is an apocalyptic number.

19998236099 is a deficient number, since it is larger than the sum of its proper divisors (1).

19998236099 is an equidigital number, since it uses as much as digits as its factorization.

19998236099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17006112, while the sum is 65.

The spelling of 19998236099 in words is "nineteen billion, nine hundred ninety-eight million, two hundred thirty-six thousand, ninety-nine".