18031801806 has 48 divisors (see below), whose sum is σ = 40596461568. Its totient is φ = 5778162000.

The previous prime is 18031801673. The next prime is 18031801807. The reversal of 18031801806 is 60810813081.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18031801807) 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 23 ways as a sum of consecutive naturals, for example, 22746 + ... + 191261.

It is an arithmetic number, because the mean of its divisors is an integer number (845759616).

Almost surely, 2^18031801806 is an apocalyptic number.

18031801806 is an abundant number, since it is smaller than the sum of its proper divisors (22564659762).

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

18031801806 is a wasteful number, since it uses less digits than its factorization.

18031801806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214197 (or 214194 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The spelling of 18031801806 in words is "eighteen billion, thirty-one million, eight hundred one thousand, eight hundred six".