18198634589 has 4 divisors (see below), whose sum is σ = 19269142524. Its totient is φ = 17128126656.

The previous prime is 18198634529. The next prime is 18198634591. The reversal of 18198634589 is 98543689181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10356115225 + 7842519364 = 101765^2 + 88558^2 .

It is a cyclic number.

It is not a de Polignac number, because 18198634589 - 2²⁴ = 18181857373 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18198634529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 535253942 + ... + 535253975.

It is an arithmetic number, because the mean of its divisors is an integer number (4817285631).

Almost surely, 2^18198634589 is an apocalyptic number.

It is an amenable number.

18198634589 is a deficient number, since it is larger than the sum of its proper divisors (1070507935).

18198634589 is a wasteful number, since it uses less digits than its factorization.

18198634589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070507934.

The product of its digits is 14929920, while the sum is 62.

The spelling of 18198634589 in words is "eighteen billion, one hundred ninety-eight million, six hundred thirty-four thousand, five hundred eighty-nine".