18042395065 has 4 divisors (see below), whose sum is σ = 21650874084. Its totient is φ = 14433916048.

The previous prime is 18042395039. The next prime is 18042395089. The reversal of 18042395065 is 56059324081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56059324081 = 13921 ⋅4026961.

It can be written as a sum of positive squares in 2 ways, for example, as 8963544976 + 9078850089 = 94676^2 + 95283^2 .

It is a cyclic number.

It is not a de Polignac number, because 18042395065 - 2³³ = 9452460473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 1804239502 + ... + 1804239511.

It is an arithmetic number, because the mean of its divisors is an integer number (5412718521).

Almost surely, 2^18042395065 is an apocalyptic number.

It is an amenable number.

18042395065 is a deficient number, since it is larger than the sum of its proper divisors (3608479019).

18042395065 is an equidigital number, since it uses as much as digits as its factorization.

18042395065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608479018.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 18042395065 in words is "eighteen billion, forty-two million, three hundred ninety-five thousand, sixty-five".