18205761812 has 12 divisors (see below), whose sum is σ = 36411523680. Its totient is φ = 7802469336.

The previous prime is 18205761773. The next prime is 18205761817. The reversal of 18205761812 is 21816750281.

18205761812 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 18205761812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18205761817) 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, 325102862 + ... + 325102917.

It is an arithmetic number, because the mean of its divisors is an integer number (3034293640).

Almost surely, 2^18205761812 is an apocalyptic number.

It is an amenable number.

18205761812 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18205761812 is a wasteful number, since it uses less digits than its factorization.

18205761812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650205790 (or 650205788 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 41.

The spelling of 18205761812 in words is "eighteen billion, two hundred five million, seven hundred sixty-one thousand, eight hundred twelve".