18040128905089 has 4 divisors (see below), whose sum is σ = 18063834725700. Its totient is φ = 18016423084480.

The previous prime is 18040128905021. The next prime is 18040128905119. The reversal of 18040128905089 is 98050982104081.

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 3245643655489 + 14794485249600 = 1801567^2 + 3846360^2 .

It is a cyclic number.

It is not a de Polignac number, because 18040128905089 - 2⁴³ = 9244035882881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18040128905009) 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, 11852909164 + ... + 11852910685.

It is an arithmetic number, because the mean of its divisors is an integer number (4515958681425).

Almost surely, 2^{18040128905089} is an apocalyptic number.

It is an amenable number.

18040128905089 is a deficient number, since it is larger than the sum of its proper divisors (23705820611).

18040128905089 is an equidigital number, since it uses as much as digits as its factorization.

18040128905089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23705820610.

The product of its (nonzero) digits is 1658880, while the sum is 55.

The spelling of 18040128905089 in words is "eighteen trillion, forty billion, one hundred twenty-eight million, nine hundred five thousand, eighty-nine".