18085399441 has 4 divisors (see below), whose sum is σ = 18086904612. Its totient is φ = 18083894272.

The previous prime is 18085399433. The next prime is 18085399447. The reversal of 18085399441 is 14499358081.

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 2825985600 + 15259413841 = 53160^2 + 123529^2 .

It is a cyclic number.

It is not a de Polignac number, because 18085399441 - 2³ = 18085399433 is a prime.

It is a super-2 number, since 2×18085399441² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18085399447) 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, 734416 + ... + 758641.

It is an arithmetic number, because the mean of its divisors is an integer number (4521726153).

Almost surely, 2^18085399441 is an apocalyptic number.

It is an amenable number.

18085399441 is a deficient number, since it is larger than the sum of its proper divisors (1505171).

18085399441 is a wasteful number, since it uses less digits than its factorization.

18085399441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505170.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 18085399441 in words is "eighteen billion, eighty-five million, three hundred ninety-nine thousand, four hundred forty-one".