19813815798 has 32 divisors (see below), whose sum is σ = 45964679424. Its totient is φ = 5576595552.

The previous prime is 19813815781. The next prime is 19813815799. The reversal of 19813815798 is 89751831891.

It is a happy number.

It is a super-3 number, since 3×19813815798³ (a number of 32 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19813815799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3517765 + ... + 3523392.

It is an arithmetic number, because the mean of its divisors is an integer number (1436396232).

Almost surely, 2^19813815798 is an apocalyptic number.

19813815798 is an abundant number, since it is smaller than the sum of its proper divisors (26150863626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19813815798 is a wasteful number, since it uses less digits than its factorization.

19813815798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041236.

The product of its digits is 4354560, while the sum is 60.

The spelling of 19813815798 in words is "nineteen billion, eight hundred thirteen million, eight hundred fifteen thousand, seven hundred ninety-eight".