18085658389 has 4 divisors (see below), whose sum is σ = 18086096556. Its totient is φ = 18085220224.

The previous prime is 18085658387. The next prime is 18085658407. The reversal of 18085658389 is 98385658081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98385658081 = 3121 ⋅31523761.

It can be written as a sum of positive squares in 2 ways, for example, as 3729544900 + 14356113489 = 61070^2 + 119817^2 .

It is a cyclic number.

It is not a de Polignac number, because 18085658389 - 2¹ = 18085658387 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 (18085658387) 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, 149884 + ... + 242149.

It is an arithmetic number, because the mean of its divisors is an integer number (4521524139).

Almost surely, 2^18085658389 is an apocalyptic number.

It is an amenable number.

18085658389 is a deficient number, since it is larger than the sum of its proper divisors (438167).

18085658389 is an equidigital number, since it uses as much as digits as its factorization.

18085658389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438166.

The product of its (nonzero) digits is 16588800, while the sum is 61.

The spelling of 18085658389 in words is "eighteen billion, eighty-five million, six hundred fifty-eight thousand, three hundred eighty-nine".