18191828219 has 4 divisors (see below), whose sum is σ = 18982777296. Its totient is φ = 17400879144.

The previous prime is 18191828191. The next prime is 18191828227. The reversal of 18191828219 is 91282819181.

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 18191828219 - 2²⁴ = 18175051003 is a prime.

It is a super-2 number, since 2×18191828219² (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 (18191828419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395474504 + ... + 395474549.

It is an arithmetic number, because the mean of its divisors is an integer number (4745694324).

Almost surely, 2^18191828219 is an apocalyptic number.

18191828219 is a deficient number, since it is larger than the sum of its proper divisors (790949077).

18191828219 is an equidigital number, since it uses as much as digits as its factorization.

18191828219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790949076.

The product of its digits is 165888, while the sum is 50.

The spelling of 18191828219 in words is "eighteen billion, one hundred ninety-one million, eight hundred twenty-eight thousand, two hundred nineteen".