18643318311 has 32 divisors (see below), whose sum is σ = 27481379328. Its totient is φ = 11182223360.

The previous prime is 18643318297. The next prime is 18643318327. The reversal of 18643318311 is 11381334681.

It is a cyclic number.

It is not a de Polignac number, because 18643318311 - 2⁹ = 18643317799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18643318311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18643318381) 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 31 ways as a sum of consecutive naturals, for example, 2373751 + ... + 2381591.

It is an arithmetic number, because the mean of its divisors is an integer number (858793104).

Almost surely, 2^18643318311 is an apocalyptic number.

18643318311 is a deficient number, since it is larger than the sum of its proper divisors (8838061017).

18643318311 is a wasteful number, since it uses less digits than its factorization.

18643318311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9911.

The product of its digits is 41472, while the sum is 39.

The spelling of 18643318311 in words is "eighteen billion, six hundred forty-three million, three hundred eighteen thousand, three hundred eleven".