216876665568 has 24 divisors (see below), whose sum is σ = 569301247368. Its totient is φ = 72292221824.

The previous prime is 216876665449. The next prime is 216876665569. The reversal of 216876665568 is 865566678612.

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 216876665499 and 216876665508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216876665569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1129565871 + ... + 1129566062.

It is an arithmetic number, because the mean of its divisors is an integer number (23720885307).

Almost surely, 2^216876665568 is an apocalyptic number.

It is an amenable number.

216876665568 is an abundant number, since it is smaller than the sum of its proper divisors (352424581800).

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

216876665568 is a wasteful number, since it uses less digits than its factorization.

216876665568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259131946 (or 2259131938 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 66.

The spelling of 216876665568 in words is "two hundred sixteen billion, eight hundred seventy-six million, six hundred sixty-five thousand, five hundred sixty-eight".