18324181845 has 12 divisors (see below), whose sum is σ = 31761915276. Its totient is φ = 9772896960.

The previous prime is 18324181829. The next prime is 18324181853. The reversal of 18324181845 is 54818142381.

18324181845 is a `hidden beast` number, since 183 + 2 + 418 + 18 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8345370609 + 9978811236 = 91353^2 + 99894^2 .

It is not a de Polignac number, because 18324181845 - 2⁴ = 18324181829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 407204041 = 18324181845 / (1 + 8 + 3 + 2 + 4 + 1 + 8 + 1 + 8 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 18324181845.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 203601976 + ... + 203602065.

It is an arithmetic number, because the mean of its divisors is an integer number (2646826273).

Almost surely, 2^18324181845 is an apocalyptic number.

18324181845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18324181845 is a deficient number, since it is larger than the sum of its proper divisors (13437733431).

18324181845 is a wasteful number, since it uses less digits than its factorization.

18324181845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407204052 (or 407204049 counting only the distinct ones).

The product of its digits is 245760, while the sum is 45.

The spelling of 18324181845 in words is "eighteen billion, three hundred twenty-four million, one hundred eighty-one thousand, eight hundred forty-five".