18333500085 has 12 divisors (see below), whose sum is σ = 31778066892. Its totient is φ = 9777866688.

The previous prime is 18333500039. The next prime is 18333500089. The reversal of 18333500085 is 58000533381.

It can be written as a sum of positive squares in 2 ways, for example, as 3506297796 + 14827202289 = 59214^2 + 121767^2 .

It is not a de Polignac number, because 18333500085 - 2³¹ = 16186016437 is a prime.

It is a super-2 number, since 2×18333500085² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18333500089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203705512 + ... + 203705601.

It is an arithmetic number, because the mean of its divisors is an integer number (2648172241).

Almost surely, 2^18333500085 is an apocalyptic number.

18333500085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18333500085 is a deficient number, since it is larger than the sum of its proper divisors (13444566807).

18333500085 is a wasteful number, since it uses less digits than its factorization.

18333500085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407411124 (or 407411121 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 18333500085 in words is "eighteen billion, three hundred thirty-three million, five hundred thousand, eighty-five".