19898266799 has 4 divisors (see below), whose sum is σ = 20584413960. Its totient is φ = 19212119640.

The previous prime is 19898266789. The next prime is 19898266807. The reversal of 19898266799 is 99766289891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19898266799 - 2⁸ = 19898266543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19898266769) 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 in 3 ways as a sum of consecutive naturals, for example, 343073537 + ... + 343073594.

It is an arithmetic number, because the mean of its divisors is an integer number (5146103490).

Almost surely, 2^19898266799 is an apocalyptic number.

19898266799 is a deficient number, since it is larger than the sum of its proper divisors (686147161).

19898266799 is an equidigital number, since it uses as much as digits as its factorization.

19898266799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 686147160.

The product of its digits is 211631616, while the sum is 74.

The spelling of 19898266799 in words is "nineteen billion, eight hundred ninety-eight million, two hundred sixty-six thousand, seven hundred ninety-nine".