8518218589 has 4 divisors (see below), whose sum is σ = 8725980060. Its totient is φ = 8310457120.

The previous prime is 8518218587. The next prime is 8518218607. The reversal of 8518218589 is 9858128158.

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 126742564 + 8391476025 = 11258^2 + 91605^2 .

It is a cyclic number.

It is not a de Polignac number, because 8518218589 - 2¹ = 8518218587 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 (8518218587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103880674 + ... + 103880755.

It is an arithmetic number, because the mean of its divisors is an integer number (2181495015).

Almost surely, 2^8518218589 is an apocalyptic number.

It is an amenable number.

8518218589 is a deficient number, since it is larger than the sum of its proper divisors (207761471).

8518218589 is a wasteful number, since it uses less digits than its factorization.

8518218589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207761470.

The product of its digits is 1843200, while the sum is 55.

The square root of 8518218589 is about 92294.1958575944. The cubic root of 8518218589 is about 2042.2845888342.

The spelling of 8518218589 in words is "eight billion, five hundred eighteen million, two hundred eighteen thousand, five hundred eighty-nine".