18005435573 has 4 divisors (see below), whose sum is σ = 19064578860. Its totient is φ = 16946292288.

The previous prime is 18005435561. The next prime is 18005435579. The reversal of 18005435573 is 37553450081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37553450081 = 7 ⋅5364778583.

It can be written as a sum of positive squares in 2 ways, for example, as 15065844049 + 2939591524 = 122743^2 + 54218^2 .

It is a cyclic number.

It is not a de Polignac number, because 18005435573 - 2⁸ = 18005435317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18005435573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18005435579) 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, 529571618 + ... + 529571651.

It is an arithmetic number, because the mean of its divisors is an integer number (4766144715).

Almost surely, 2^18005435573 is an apocalyptic number.

It is an amenable number.

18005435573 is a deficient number, since it is larger than the sum of its proper divisors (1059143287).

18005435573 is a wasteful number, since it uses less digits than its factorization.

18005435573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059143286.

The product of its (nonzero) digits is 252000, while the sum is 41.

The spelling of 18005435573 in words is "eighteen billion, five million, four hundred thirty-five thousand, five hundred seventy-three".