18185311000 has 32 divisors (see below), whose sum is σ = 42553630080. Its totient is φ = 7274124000.

The previous prime is 18185310961. The next prime is 18185311003. The reversal of 18185311000 is 11358181.

It is a self number, because there is not a number n which added to its sum of digits gives 18185311000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18185311003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9091656 + ... + 9093655.

It is an arithmetic number, because the mean of its divisors is an integer number (1329800940).

Almost surely, 2^18185311000 is an apocalyptic number.

18185311000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18185311000 is an abundant number, since it is smaller than the sum of its proper divisors (24368319080).

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

18185311000 is a wasteful number, since it uses less digits than its factorization.

18185311000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18185332 (or 18185318 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 28.

Adding to 18185311000 its reverse (11358181), we get a palindrome (18196669181).

The spelling of 18185311000 in words is "eighteen billion, one hundred eighty-five million, three hundred eleven thousand".