18164685389 has 4 divisors (see below), whose sum is σ = 18507415356. Its totient is φ = 17821955424.

The previous prime is 18164685377. The next prime is 18164685401. The reversal of 18164685389 is 98358646181.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (18164685377) and next prime (18164685401).

It can be written as a sum of positive squares in 2 ways, for example, as 15847033225 + 2317652164 = 125885^2 + 48142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18164685389 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 (18164625389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171364904 + ... + 171365009.

It is an arithmetic number, because the mean of its divisors is an integer number (4626853839).

Almost surely, 2^18164685389 is an apocalyptic number.

It is an amenable number.

18164685389 is a deficient number, since it is larger than the sum of its proper divisors (342729967).

18164685389 is an equidigital number, since it uses as much as digits as its factorization.

18164685389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342729966.

The product of its digits is 9953280, while the sum is 59.

The spelling of 18164685389 in words is "eighteen billion, one hundred sixty-four million, six hundred eighty-five thousand, three hundred eighty-nine".