18348612305 has 4 divisors (see below), whose sum is σ = 22018334772. Its totient is φ = 14678889840.

The previous prime is 18348612283. The next prime is 18348612313. The reversal of 18348612305 is 50321684381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50321684381 = 443 ⋅113592967.

It can be written as a sum of positive squares in 2 ways, for example, as 6620588689 + 11728023616 = 81367^2 + 108296^2 .

It is not a de Polignac number, because 18348612305 - 2¹⁸ = 18348350161 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1834861226 + ... + 1834861235.

It is an arithmetic number, because the mean of its divisors is an integer number (5504583693).

Almost surely, 2^18348612305 is an apocalyptic number.

It is an amenable number.

18348612305 is a deficient number, since it is larger than the sum of its proper divisors (3669722467).

18348612305 is an equidigital number, since it uses as much as digits as its factorization.

18348612305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3669722466.

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 18348612305 in words is "eighteen billion, three hundred forty-eight million, six hundred twelve thousand, three hundred five".