181820000185 has 8 divisors (see below), whose sum is σ = 218702254536. Its totient is φ = 145110497280.

The previous prime is 181820000149. The next prime is 181820000203. The reversal of 181820000185 is 581000028181.

It can be written as a sum of positive squares in 4 ways, for example, as 4791962176 + 177028038009 = 69224^2 + 420747^2 .

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

It is not a de Polignac number, because 181820000185 - 2¹¹ = 181819998137 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 181820000185.

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, 43185544 + ... + 43189753.

It is an arithmetic number, because the mean of its divisors is an integer number (27337781817).

Almost surely, 2^181820000185 is an apocalyptic number.

It is an amenable number.

181820000185 is a deficient number, since it is larger than the sum of its proper divisors (36882254351).

181820000185 is an equidigital number, since it uses as much as digits as its factorization.

181820000185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86375723.

The product of its (nonzero) digits is 5120, while the sum is 34.

The spelling of 181820000185 in words is "one hundred eighty-one billion, eight hundred twenty million, one hundred eighty-five", and thus it is an aban number.