18519038905 has 8 divisors (see below), whose sum is σ = 22823464392. Its totient is φ = 14414819328.

The previous prime is 18519038899. The next prime is 18519038969. The reversal of 18519038905 is 50983091581.

It can be written as a sum of positive squares in 4 ways, for example, as 6285794089 + 12233244816 = 79283^2 + 110604^2 .

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 18519038905 - 2⁵ = 18519038873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50051272 + ... + 50051641.

It is an arithmetic number, because the mean of its divisors is an integer number (2852933049).

Almost surely, 2^18519038905 is an apocalyptic number.

It is an amenable number.

18519038905 is a deficient number, since it is larger than the sum of its proper divisors (4304425487).

18519038905 is a wasteful number, since it uses less digits than its factorization.

18519038905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100102955.

The product of its (nonzero) digits is 388800, while the sum is 49.

The spelling of 18519038905 in words is "eighteen billion, five hundred nineteen million, thirty-eight thousand, nine hundred five".