18225331889 has 8 divisors (see below), whose sum is σ = 18305228328. Its totient is φ = 18145607040.

The previous prime is 18225331841. The next prime is 18225331897. The reversal of 18225331889 is 98813352281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1836979600 + 16388352289 = 42860^2 + 128017^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18225331889 - 2¹² = 18225327793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18225321889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172349 + ... + 257205.

It is an arithmetic number, because the mean of its divisors is an integer number (2288153541).

Almost surely, 2^18225331889 is an apocalyptic number.

It is an amenable number.

18225331889 is a deficient number, since it is larger than the sum of its proper divisors (79896439).

18225331889 is an equidigital number, since it uses as much as digits as its factorization.

18225331889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85795.

The product of its digits is 829440, while the sum is 50.

The spelling of 18225331889 in words is "eighteen billion, two hundred twenty-five million, three hundred thirty-one thousand, eight hundred eighty-nine".