18311821009112 has 8 divisors (see below), whose sum is σ = 34334664392100. Its totient is φ = 9155910504552.

The previous prime is 18311821009063. The next prime is 18311821009117. The reversal of 18311821009112 is 21190012811381.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18311821009117) 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 as a sum of consecutive naturals, namely, 1144488813062 + ... + 1144488813077.

Almost surely, 2^{18311821009112} is an apocalyptic number.

It is an amenable number.

18311821009112 is a deficient number, since it is larger than the sum of its proper divisors (16022843382988).

18311821009112 is a wasteful number, since it uses less digits than its factorization.

18311821009112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2288977626145 (or 2288977626141 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 38.

The spelling of 18311821009112 in words is "eighteen trillion, three hundred eleven billion, eight hundred twenty-one million, nine thousand, one hundred twelve".