18350185185 has 24 divisors (see below), whose sum is σ = 31814798184. Its totient is φ = 9784362240.

The previous prime is 18350185181. The next prime is 18350185193. The reversal of 18350185185 is 58158105381.

18350185185 is a `hidden beast` number, since 1 + 83 + 50 + 1 + 8 + 518 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 3057647616 + 15292537569 = 55296^2 + 123663^2 .

It is not a de Polignac number, because 18350185185 - 2² = 18350185181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

18350185185 is a modest number, since divided by 185185 gives 18350 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 18350185185.

It is not an unprimeable number, because it can be changed into a prime (18350185181) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143445 + ... + 239325.

It is an arithmetic number, because the mean of its divisors is an integer number (1325616591).

Almost surely, 2^18350185185 is an apocalyptic number.

18350185185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18350185185 is a deficient number, since it is larger than the sum of its proper divisors (13464612999).

18350185185 is a wasteful number, since it uses less digits than its factorization.

18350185185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100145 (or 100142 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 45.

The spelling of 18350185185 in words is "eighteen billion, three hundred fifty million, one hundred eighty-five thousand, one hundred eighty-five".