18019820019 has 4 divisors (see below), whose sum is σ = 24026426696. Its totient is φ = 12013213344.

The previous prime is 18019820017. The next prime is 18019820023. The reversal of 18019820019 is 91002891081.

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

It is not a de Polignac number, because 18019820019 - 2¹ = 18019820017 is a prime.

It is a super-2 number, since 2×18019820019² (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 (18019820017) 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, 3003303334 + ... + 3003303339.

It is an arithmetic number, because the mean of its divisors is an integer number (6006606674).

Almost surely, 2^18019820019 is an apocalyptic number.

18019820019 is a deficient number, since it is larger than the sum of its proper divisors (6006606677).

18019820019 is an equidigital number, since it uses as much as digits as its factorization.

18019820019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6006606676.

The product of its (nonzero) digits is 10368, while the sum is 39.

The spelling of 18019820019 in words is "eighteen billion, nineteen million, eight hundred twenty thousand, nineteen".