18031330213 has 16 divisors (see below), whose sum is σ = 20088820080. Its totient is φ = 16076192256.

The previous prime is 18031330199. The next prime is 18031330231. The reversal of 18031330213 is 31203313081.

It can be written as a sum of positive squares in 8 ways, for example, as 3407990884 + 14623339329 = 58378^2 + 120927^2 .

It is a cyclic number.

It is not a de Polignac number, because 18031330213 - 2¹³ = 18031322021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18031330283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70918 + ... + 202711.

It is an arithmetic number, because the mean of its divisors is an integer number (1255551255).

Almost surely, 2^18031330213 is an apocalyptic number.

18031330213 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18031330213 is a deficient number, since it is larger than the sum of its proper divisors (2057489867).

18031330213 is a wasteful number, since it uses less digits than its factorization.

18031330213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273816.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 18031330213 its reverse (31203313081), we get a palindrome (49234643294).

The spelling of 18031330213 in words is "eighteen billion, thirty-one million, three hundred thirty thousand, two hundred thirteen".