19816798889 has 8 divisors (see below), whose sum is σ = 19842822912. Its totient is φ = 19790794800.

The previous prime is 19816798861. The next prime is 19816798891. The reversal of 19816798889 is 98889761891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19816798889 - 2¹² = 19816794793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19816791889) 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 7 ways as a sum of consecutive naturals, for example, 3106307 + ... + 3112679.

It is an arithmetic number, because the mean of its divisors is an integer number (2480352864).

Almost surely, 2^19816798889 is an apocalyptic number.

It is an amenable number.

19816798889 is a deficient number, since it is larger than the sum of its proper divisors (26024023).

19816798889 is a wasteful number, since it uses less digits than its factorization.

19816798889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9967.

The product of its digits is 125411328, while the sum is 74.

The spelling of 19816798889 in words is "nineteen billion, eight hundred sixteen million, seven hundred ninety-eight thousand, eight hundred eighty-nine".