19819800019 has 4 divisors (see below), whose sum is σ = 19822645296. Its totient is φ = 19816954744.

The previous prime is 19819799999. The next prime is 19819800061. The reversal of 19819800019 is 91000891891.

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 19819800019 - 2⁷ = 19819799891 is a prime.

It is a super-2 number, since 2×19819800019² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19819800079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1412164 + ... + 1426129.

It is an arithmetic number, because the mean of its divisors is an integer number (4955661324).

Almost surely, 2^19819800019 is an apocalyptic number.

19819800019 is a deficient number, since it is larger than the sum of its proper divisors (2845277).

19819800019 is an equidigital number, since it uses as much as digits as its factorization.

19819800019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2845276.

The product of its (nonzero) digits is 46656, while the sum is 46.

The spelling of 19819800019 in words is "nineteen billion, eight hundred nineteen million, eight hundred thousand, nineteen".