18443315789 has 4 divisors (see below), whose sum is σ = 19414016640. Its totient is φ = 17472614940.

The previous prime is 18443315777. The next prime is 18443315797. The reversal of 18443315789 is 98751334481.

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: 98751334481 = 47 ⋅2101092223.

It is a cyclic number.

It is not a de Polignac number, because 18443315789 - 2⁸ = 18443315533 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 18443315789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443315089) 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, 485350397 + ... + 485350434.

It is an arithmetic number, because the mean of its divisors is an integer number (4853504160).

Almost surely, 2^18443315789 is an apocalyptic number.

18443315789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18443315789 is a deficient number, since it is larger than the sum of its proper divisors (970700851).

18443315789 is an equidigital number, since it uses as much as digits as its factorization.

18443315789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970700850.

The product of its digits is 2903040, while the sum is 53.

The spelling of 18443315789 in words is "eighteen billion, four hundred forty-three million, three hundred fifteen thousand, seven hundred eighty-nine".