18311423312 has 40 divisors (see below), whose sum is σ = 43665705216. Its totient is φ = 7244078976.

The previous prime is 18311423311. The next prime is 18311423329. The reversal of 18311423312 is 21332411381.

It is a super-2 number, since 2×18311423312² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311423311) 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 7 ways as a sum of consecutive naturals, for example, 6286808 + ... + 6289719.

Almost surely, 2^18311423312 is an apocalyptic number.

It is an amenable number.

18311423312 is an abundant number, since it is smaller than the sum of its proper divisors (25354281904).

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

18311423312 is a wasteful number, since it uses less digits than its factorization.

18311423312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12576555 (or 12576549 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

Adding to 18311423312 its reverse (21332411381), we get a palindrome (39643834693).

The spelling of 18311423312 in words is "eighteen billion, three hundred eleven million, four hundred twenty-three thousand, three hundred twelve".