18981843796916 has 864 divisors, whose sum is σ = 50195749524480. Its totient is φ = 6165534412800.

The previous prime is 18981843796907. The next prime is 18981843796997. The reversal of 18981843796916 is 61969734818981.

It is a super-2 number, since 2×18981843796916² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 287 ways as a sum of consecutive naturals, for example, 22897277990 + ... + 22897278818.

It is an arithmetic number, because the mean of its divisors is an integer number (58096932320).

Almost surely, 2^{18981843796916} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18981843796916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25097874762240).

18981843796916 is an abundant number, since it is smaller than the sum of its proper divisors (31213905727564).

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

18981843796916 is a wasteful number, since it uses less digits than its factorization.

18981843796916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013 (or 985 counting only the distinct ones).

The product of its digits is 1128701952, while the sum is 80.

The spelling of 18981843796916 in words is "eighteen trillion, nine hundred eighty-one billion, eight hundred forty-three million, seven hundred ninety-six thousand, nine hundred sixteen".