18609435085 has 8 divisors (see below), whose sum is σ = 22934871576. Its totient is φ = 14485181760.

The previous prime is 18609435073. The next prime is 18609435139. The reversal of 18609435085 is 58053490681.

It can be written as a sum of positive squares in 4 ways, for example, as 2643090921 + 15966344164 = 51411^2 + 126358^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18609435085 - 2¹⁷ = 18609304013 is a prime.

It is a super-4 number, since 4×18609435085⁴ (a number of 42 digits) contains 4444 as substring. Note that it is a super-d number also for d = 3, 2.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50295586 + ... + 50295955.

It is an arithmetic number, because the mean of its divisors is an integer number (2866858947).

Almost surely, 2^18609435085 is an apocalyptic number.

It is an amenable number.

18609435085 is a deficient number, since it is larger than the sum of its proper divisors (4325436491).

18609435085 is a wasteful number, since it uses less digits than its factorization.

18609435085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100591583.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 18609435085 in words is "eighteen billion, six hundred nine million, four hundred thirty-five thousand, eighty-five".