18159927889 has 4 divisors (see below), whose sum is σ = 18162806256. Its totient is φ = 18157049524.

The previous prime is 18159927839. The next prime is 18159927941. The reversal of 18159927889 is 98872995181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18159927889 - 2¹⁷ = 18159796817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18159927839) 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, 1429699 + ... + 1442344.

It is an arithmetic number, because the mean of its divisors is an integer number (4540701564).

Almost surely, 2^18159927889 is an apocalyptic number.

It is an amenable number.

18159927889 is a deficient number, since it is larger than the sum of its proper divisors (2878367).

18159927889 is an equidigital number, since it uses as much as digits as its factorization.

18159927889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878366.

The product of its digits is 26127360, while the sum is 67.

The spelling of 18159927889 in words is "eighteen billion, one hundred fifty-nine million, nine hundred twenty-seven thousand, eight hundred eighty-nine".