18866823212312 has 16 divisors (see below), whose sum is σ = 37456193142360. Its totient is φ = 8878505041024.

The previous prime is 18866823212311. The next prime is 18866823212339. The reversal of 18866823212312 is 21321232866881.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18866823212311) 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 3 ways as a sum of consecutive naturals, for example, 69363320498 + ... + 69363320769.

Almost surely, 2^{18866823212312} is an apocalyptic number.

It is an amenable number.

18866823212312 is a deficient number, since it is larger than the sum of its proper divisors (18589369930048).

18866823212312 is a wasteful number, since it uses less digits than its factorization.

18866823212312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138726641290 (or 138726641286 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 53.

The spelling of 18866823212312 in words is "eighteen trillion, eight hundred sixty-six billion, eight hundred twenty-three million, two hundred twelve thousand, three hundred twelve".