216676322806729 has 2 divisors, whose sum is σ = 216676322806730. Its totient is φ = 216676322806728.

The previous prime is 216676322806613. The next prime is 216676322806739. The reversal of 216676322806729 is 927608223676612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198254200396729 + 18422122410000 = 14080277^2 + 4292100^2 .

It is a cyclic number.

It is not a de Polignac number, because 216676322806729 - 2¹⁵ = 216676322773961 is a prime.

It is not a weakly prime, because it can be changed into another prime (216676322806739) by changing a digit.

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 as a sum of consecutive naturals, namely, 108338161403364 + 108338161403365.

It is an arithmetic number, because the mean of its divisors is an integer number (108338161403365).

Almost surely, 2^{216676322806729} is an apocalyptic number.

It is an amenable number.

216676322806729 is a deficient number, since it is larger than the sum of its proper divisors (1).

216676322806729 is an equidigital number, since it uses as much as digits as its factorization.

216676322806729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 219469824, while the sum is 67.

The spelling of 216676322806729 in words is "two hundred sixteen trillion, six hundred seventy-six billion, three hundred twenty-two million, eight hundred six thousand, seven hundred twenty-nine".