216343663 has 2 divisors, whose sum is σ = 216343664. Its totient is φ = 216343662.

The previous prime is 216343661. The next prime is 216343669. The reversal of 216343663 is 366343612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216343663 - 2¹ = 216343661 is a prime.

Together with 216343661, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216343661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108171831 + 108171832.

It is an arithmetic number, because the mean of its divisors is an integer number (108171832).

Almost surely, 2^216343663 is an apocalyptic number.

216343663 is a deficient number, since it is larger than the sum of its proper divisors (1).

216343663 is an equidigital number, since it uses as much as digits as its factorization.

216343663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 34.

The square root of 216343663 is about 14708.6254626325. The cubic root of 216343663 is about 600.3180378715.

The spelling of 216343663 in words is "two hundred sixteen million, three hundred forty-three thousand, six hundred sixty-three".