18287217119 has 4 divisors (see below), whose sum is σ = 18518700960. Its totient is φ = 18055733280.

The previous prime is 18287217089. The next prime is 18287217121. The reversal of 18287217119 is 91171278281.

It is a happy number.

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 18287217119 - 2²⁰ = 18286168543 is a prime.

It is a super-2 number, since 2×18287217119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18287217139) 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, 115741802 + ... + 115741959.

It is an arithmetic number, because the mean of its divisors is an integer number (4629675240).

Almost surely, 2^18287217119 is an apocalyptic number.

18287217119 is a deficient number, since it is larger than the sum of its proper divisors (231483841).

18287217119 is an equidigital number, since it uses as much as digits as its factorization.

18287217119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231483840.

The product of its digits is 112896, while the sum is 47.

It can be divided in two parts, 182872 and 17119, that added together give a palindrome (199991).

The spelling of 18287217119 in words is "eighteen billion, two hundred eighty-seven million, two hundred seventeen thousand, one hundred nineteen".