18026012689 has 4 divisors (see below), whose sum is σ = 18033454656. Its totient is φ = 18018570724.

The previous prime is 18026012677. The next prime is 18026012707. The reversal of 18026012689 is 98621062081.

It is a happy number.

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 18026012689 - 2¹¹ = 18026010641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18026012189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3717349 + ... + 3722194.

It is an arithmetic number, because the mean of its divisors is an integer number (4508363664).

Almost surely, 2^18026012689 is an apocalyptic number.

It is an amenable number.

18026012689 is a deficient number, since it is larger than the sum of its proper divisors (7441967).

18026012689 is an equidigital number, since it uses as much as digits as its factorization.

18026012689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7441966.

The product of its (nonzero) digits is 82944, while the sum is 43.

The spelling of 18026012689 in words is "eighteen billion, twenty-six million, twelve thousand, six hundred eighty-nine".