216668843255 has 8 divisors (see below), whose sum is σ = 262683051792. Its totient is φ = 171548114688.

The previous prime is 216668843143. The next prime is 216668843263. The reversal of 216668843255 is 552348866612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216668843255 is a prime.

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 216668843255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223369457 + ... + 223370426.

It is an arithmetic number, because the mean of its divisors is an integer number (32835381474).

Almost surely, 2^216668843255 is an apocalyptic number.

216668843255 is a deficient number, since it is larger than the sum of its proper divisors (46014208537).

216668843255 is an equidigital number, since it uses as much as digits as its factorization.

216668843255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446739985.

The product of its digits is 16588800, while the sum is 56.

The spelling of 216668843255 in words is "two hundred sixteen billion, six hundred sixty-eight million, eight hundred forty-three thousand, two hundred fifty-five".