216668843256 has 16 divisors (see below), whose sum is σ = 541672108200. Its totient is φ = 72222947744.

The previous prime is 216668843143. The next prime is 216668843263. The reversal of 216668843256 is 652348866612.

It is a happy number.

216668843256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 216668843196 and 216668843205.

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 3 ways as a sum of consecutive naturals, for example, 4513934211 + ... + 4513934258.

Almost surely, 2^216668843256 is an apocalyptic number.

It is an amenable number.

216668843256 is an abundant number, since it is smaller than the sum of its proper divisors (325003264944).

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

216668843256 is a wasteful number, since it uses less digits than its factorization.

216668843256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9027868478 (or 9027868474 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 57.

The spelling of 216668843256 in words is "two hundred sixteen billion, six hundred sixty-eight million, eight hundred forty-three thousand, two hundred fifty-six".