18308441369 has 4 divisors (see below), whose sum is σ = 18360306996. Its totient is φ = 18256575744.

The previous prime is 18308441357. The next prime is 18308441383. The reversal of 18308441369 is 96314480381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3327905344 + 14980536025 = 57688^2 + 122395^2 .

It is a cyclic number.

It is not a de Polignac number, because 18308441369 - 2²⁰ = 18307392793 is a prime.

It is a super-2 number, since 2×18308441369² (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 (18308446369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25932284 + ... + 25932989.

It is an arithmetic number, because the mean of its divisors is an integer number (4590076749).

Almost surely, 2^18308441369 is an apocalyptic number.

It is an amenable number.

18308441369 is a deficient number, since it is larger than the sum of its proper divisors (51865627).

18308441369 is an equidigital number, since it uses as much as digits as its factorization.

18308441369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51865626.

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 18308441369 in words is "eighteen billion, three hundred eight million, four hundred forty-one thousand, three hundred sixty-nine".