18243244133 has 4 divisors (see below), whose sum is σ = 18337768908. Its totient is φ = 18148719360.

The previous prime is 18243244091. The next prime is 18243244141. The reversal of 18243244133 is 33144234281.

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 1260463009 + 16982781124 = 35503^2 + 130318^2 .

It is a cyclic number.

It is not a de Polignac number, because 18243244133 - 2²⁶ = 18176135269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18243244093 and 18243244102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243244333) 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, 47262098 + ... + 47262483.

It is an arithmetic number, because the mean of its divisors is an integer number (4584442227).

Almost surely, 2^18243244133 is an apocalyptic number.

It is an amenable number.

18243244133 is a deficient number, since it is larger than the sum of its proper divisors (94524775).

18243244133 is an equidigital number, since it uses as much as digits as its factorization.

18243244133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94524774.

The product of its digits is 55296, while the sum is 35.

The spelling of 18243244133 in words is "eighteen billion, two hundred forty-three million, two hundred forty-four thousand, one hundred thirty-three".