18361100185 has 4 divisors (see below), whose sum is σ = 22033320228. Its totient is φ = 14688880144.

The previous prime is 18361100183. The next prime is 18361100201. The reversal of 18361100185 is 58100116381.

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 6307695241 + 12053404944 = 79421^2 + 109788^2 .

It is a cyclic number.

It is not a de Polignac number, because 18361100185 - 2¹ = 18361100183 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 18361100185.

It is not an unprimeable number, because it can be changed into a prime (18361100183) 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, 1836110014 + ... + 1836110023.

It is an arithmetic number, because the mean of its divisors is an integer number (5508330057).

Almost surely, 2^18361100185 is an apocalyptic number.

It is an amenable number.

18361100185 is a deficient number, since it is larger than the sum of its proper divisors (3672220043).

18361100185 is an equidigital number, since it uses as much as digits as its factorization.

18361100185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3672220042.

The product of its (nonzero) digits is 5760, while the sum is 34.

The spelling of 18361100185 in words is "eighteen billion, three hundred sixty-one million, one hundred thousand, one hundred eighty-five".