18503533489 has 4 divisors (see below), whose sum is σ = 21146895424. Its totient is φ = 15860171556.

The previous prime is 18503533483. The next prime is 18503533513. The reversal of 18503533489 is 98433530581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98433530581 = 11579 ⋅8501039.

It is a cyclic number.

It is not a de Polignac number, because 18503533489 - 2⁷ = 18503533361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18503533483) 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, 1321680957 + ... + 1321680970.

It is an arithmetic number, because the mean of its divisors is an integer number (5286723856).

Almost surely, 2^18503533489 is an apocalyptic number.

It is an amenable number.

18503533489 is a deficient number, since it is larger than the sum of its proper divisors (2643361935).

18503533489 is an equidigital number, since it uses as much as digits as its factorization.

18503533489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643361934.

The product of its (nonzero) digits is 1555200, while the sum is 49.

The spelling of 18503533489 in words is "eighteen billion, five hundred three million, five hundred thirty-three thousand, four hundred eighty-nine".