18681744351912 has 32 divisors (see below), whose sum is σ = 46815297629280. Its totient is φ = 6212456550720.

The previous prime is 18681744351859. The next prime is 18681744351931. The reversal of 18681744351912 is 21915344718681.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 924462598 + ... + 924482805.

It is an arithmetic number, because the mean of its divisors is an integer number (1462978050915).

Almost surely, 2^{18681744351912} is an apocalyptic number.

18681744351912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18681744351912 is an abundant number, since it is smaller than the sum of its proper divisors (28133553277368).

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

18681744351912 is a wasteful number, since it uses less digits than its factorization.

18681744351912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1848945833 (or 1848945829 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 60.

The spelling of 18681744351912 in words is "eighteen trillion, six hundred eighty-one billion, seven hundred forty-four million, three hundred fifty-one thousand, nine hundred twelve".