18033873449 has 4 divisors (see below), whose sum is σ = 18034720980. Its totient is φ = 18033025920.

The previous prime is 18033873433. The next prime is 18033873469. The reversal of 18033873449 is 94437833081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94437833081 = 15091 ⋅6257891.

It can be written as a sum of positive squares in 2 ways, for example, as 8408890000 + 9624983449 = 91700^2 + 98107^2 .

It is a cyclic number.

It is not a de Polignac number, because 18033873449 - 2⁴ = 18033873433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18033873397 and 18033873406.

It is not an unprimeable number, because it can be changed into a prime (18033873469) 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, 391004 + ... + 434685.

It is an arithmetic number, because the mean of its divisors is an integer number (4508680245).

Almost surely, 2^18033873449 is an apocalyptic number.

It is an amenable number.

18033873449 is a deficient number, since it is larger than the sum of its proper divisors (847531).

18033873449 is an equidigital number, since it uses as much as digits as its factorization.

18033873449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847530.

The product of its (nonzero) digits is 1741824, while the sum is 50.

The spelling of 18033873449 in words is "eighteen billion, thirty-three million, eight hundred seventy-three thousand, four hundred forty-nine".