8216317371681 has 16 divisors (see below), whose sum is σ = 12193639606720. Its totient is φ = 5467952005920.

The previous prime is 8216317371649. The next prime is 8216317371701. The reversal of 8216317371681 is 1861737136128.

8216317371681 is a `hidden beast` number, since 8 + 216 + 317 + 37 + 1 + 6 + 81 = 666.

It is not a de Polignac number, because 8216317371681 - 2⁵ = 8216317371649 is a prime.

It is a super-2 number, since 2×8216317371681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8216317381681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 266453980 + ... + 266484813.

It is an arithmetic number, because the mean of its divisors is an integer number (762102475420).

Almost surely, 2^{8216317371681} is an apocalyptic number.

It is an amenable number.

8216317371681 is a deficient number, since it is larger than the sum of its proper divisors (3977322235039).

8216317371681 is a wasteful number, since it uses less digits than its factorization.

8216317371681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532939373 (or 532939367 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 8216317371681 in words is "eight trillion, two hundred sixteen billion, three hundred seventeen million, three hundred seventy-one thousand, six hundred eighty-one".