18025446805 has 4 divisors (see below), whose sum is σ = 21630536172. Its totient is φ = 14420357440.

The previous prime is 18025446787. The next prime is 18025446809. The reversal of 18025446805 is 50864452081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50864452081 = 17 ⋅2992026593.

It can be written as a sum of positive squares in 2 ways, for example, as 6720228529 + 11305218276 = 81977^2 + 106326^2 .

It is not a de Polignac number, because 18025446805 - 2¹¹ = 18025444757 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 (18025446809) 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, 1802544676 + ... + 1802544685.

It is an arithmetic number, because the mean of its divisors is an integer number (5407634043).

Almost surely, 2^18025446805 is an apocalyptic number.

It is an amenable number.

18025446805 is a deficient number, since it is larger than the sum of its proper divisors (3605089367).

18025446805 is an equidigital number, since it uses as much as digits as its factorization.

18025446805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3605089366.

The product of its (nonzero) digits is 307200, while the sum is 43.

Adding to 18025446805 its reverse (50864452081), we get a palindrome (68889898886).

The spelling of 18025446805 in words is "eighteen billion, twenty-five million, four hundred forty-six thousand, eight hundred five".