181850000000 has 144 divisors (see below), whose sum is σ = 452973400890. Its totient is φ = 72720000000.

The previous prime is 181849999963. The next prime is 181850000047. The reversal of 181850000000 is 58181.

It can be written as a sum of positive squares in 9 ways, for example, as 142261734976 + 39588265024 = 377176^2 + 198968^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 49998182 + ... + 50001818.

Almost surely, 2^181850000000 is an apocalyptic number.

181850000000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181850000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (226486700445).

181850000000 is an abundant number, since it is smaller than the sum of its proper divisors (271123400890).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181850000000 is an frugal number, since it uses more digits than its factorization.

181850000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3691 (or 3644 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

Adding to 181850000000 its reverse (58181), we get a palindrome (181850058181).

The spelling of 181850000000 in words is "one hundred eighty-one billion, eight hundred fifty million", and thus it is an aban number.