216668843263 has 2 divisors, whose sum is σ = 216668843264. Its totient is φ = 216668843262.

The previous prime is 216668843143. The next prime is 216668843273. The reversal of 216668843263 is 362348866612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216668843263 - 2⁹ = 216668842751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216668843273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108334421631 + 108334421632.

It is an arithmetic number, because the mean of its divisors is an integer number (108334421632).

Almost surely, 2^216668843263 is an apocalyptic number.

216668843263 is a deficient number, since it is larger than the sum of its proper divisors (1).

216668843263 is an equidigital number, since it uses as much as digits as its factorization.

216668843263 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 55.

The spelling of 216668843263 in words is "two hundred sixteen billion, six hundred sixty-eight million, eight hundred forty-three thousand, two hundred sixty-three".