19717187683216 has 45 divisors (see below), whose sum is σ = 38289971863731. Its totient is φ = 9835956662016.

The previous prime is 19717187683163. The next prime is 19717187683223. The reversal of 19717187683216 is 61238678171791.

The square root of 19717187683216 is 4440404.

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 1146604073616 + 18570583609600 = 1070796^2 + 4309360^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9893219116 + ... + 9893221108.

Almost surely, 2^{19717187683216} is an apocalyptic number.

19717187683216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19717187683216 is the 4440404-th square number.

It is an amenable number.

19717187683216 is a deficient number, since it is larger than the sum of its proper divisors (18572784180515).

19717187683216 is an frugal number, since it uses more digits than its factorization.

19717187683216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5108 (or 2552 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 67.

The spelling of 19717187683216 in words is "nineteen trillion, seven hundred seventeen billion, one hundred eighty-seven million, six hundred eighty-three thousand, two hundred sixteen".