18219158989 has 8 divisors (see below), whose sum is σ = 18269618040. Its totient is φ = 18168729600.

The previous prime is 18219158987. The next prime is 18219159083. The reversal of 18219158989 is 98985191281.

It can be written as a sum of positive squares in 4 ways, for example, as 2792276964 + 15426882025 = 52842^2 + 124205^2 .

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 18219158989 - 2¹ = 18219158987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18219158987) 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, 1827759 + ... + 1837699.

It is an arithmetic number, because the mean of its divisors is an integer number (2283702255).

Almost surely, 2^18219158989 is an apocalyptic number.

It is an amenable number.

18219158989 is a deficient number, since it is larger than the sum of its proper divisors (50459051).

18219158989 is an equidigital number, since it uses as much as digits as its factorization.

18219158989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14831.

The product of its digits is 3732480, while the sum is 61.

The spelling of 18219158989 in words is "eighteen billion, two hundred nineteen million, one hundred fifty-eight thousand, nine hundred eighty-nine".