18718982983936 has 81 divisors (see below), whose sum is σ = 37714193712559. Its totient is φ = 9272787550208.

The previous prime is 18718982983933. The next prime is 18718982983937. The reversal of 18718982983936 is 63938928981781.

It is a happy number.

The square root of 18718982983936 is 4326544.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 17311058350336 + 1407924633600 = 4160656^2 + 1186560^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18718982983936.

It is not an unprimeable number, because it can be changed into a prime (18718982983933) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 7822390356 + ... + 7822392748.

Almost surely, 2^{18718982983936} is an apocalyptic number.

18718982983936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18718982983936 is the 4326544-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18718982983936

18718982983936 is an abundant number, since it is smaller than the sum of its proper divisors (18995210728623).

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

18718982983936 is an frugal number, since it uses more digits than its factorization.

18718982983936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5028 (or 2508 counting only the distinct ones).

The product of its digits is 2257403904, while the sum is 82.

The spelling of 18718982983936 in words is "eighteen trillion, seven hundred eighteen billion, nine hundred eighty-two million, nine hundred eighty-three thousand, nine hundred thirty-six".