18203853443 has 4 divisors (see below), whose sum is σ = 18695849520. Its totient is φ = 17711857368.

The previous prime is 18203853433. The next prime is 18203853509. The reversal of 18203853443 is 34435830281.

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 18203853443 - 2⁶ = 18203853379 is a prime.

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 18203853443.

It is not an unprimeable number, because it can be changed into a prime (18203853433) 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, 245997983 + ... + 245998056.

It is an arithmetic number, because the mean of its divisors is an integer number (4673962380).

Almost surely, 2^18203853443 is an apocalyptic number.

18203853443 is a deficient number, since it is larger than the sum of its proper divisors (491996077).

18203853443 is an equidigital number, since it uses as much as digits as its factorization.

18203853443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491996076.

The product of its (nonzero) digits is 276480, while the sum is 41.

The spelling of 18203853443 in words is "eighteen billion, two hundred three million, eight hundred fifty-three thousand, four hundred forty-three".