18505435319 has 4 divisors (see below), whose sum is σ = 21149068944. Its totient is φ = 15861801696.

The previous prime is 18505435283. The next prime is 18505435367. The reversal of 18505435319 is 91353450581.

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 18505435319 - 2²⁴ = 18488658103 is a prime.

It is a super-2 number, since 2×18505435319² (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 18505435319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18505431319) 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, 1321816802 + ... + 1321816815.

It is an arithmetic number, because the mean of its divisors is an integer number (5287267236).

Almost surely, 2^18505435319 is an apocalyptic number.

18505435319 is a deficient number, since it is larger than the sum of its proper divisors (2643633625).

18505435319 is an equidigital number, since it uses as much as digits as its factorization.

18505435319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643633624.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 18505435319 in words is "eighteen billion, five hundred five million, four hundred thirty-five thousand, three hundred nineteen".