18350017919 has 4 divisors (see below), whose sum is σ = 18352707120. Its totient is φ = 18347328720.

The previous prime is 18350017897. The next prime is 18350017921. The reversal of 18350017919 is 91971005381.

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 18350017919 - 2¹² = 18350013823 is a prime.

It is a super-2 number, since 2×18350017919² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18350017919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18350017979) 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, 1334339 + ... + 1348020.

It is an arithmetic number, because the mean of its divisors is an integer number (4588176780).

Almost surely, 2^18350017919 is an apocalyptic number.

18350017919 is a deficient number, since it is larger than the sum of its proper divisors (2689201).

18350017919 is an equidigital number, since it uses as much as digits as its factorization.

18350017919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689200.

The product of its (nonzero) digits is 68040, while the sum is 44.

The spelling of 18350017919 in words is "eighteen billion, three hundred fifty million, seventeen thousand, nine hundred nineteen".