216688206868879 has 2 divisors, whose sum is σ = 216688206868880. Its totient is φ = 216688206868878.

The previous prime is 216688206868853. The next prime is 216688206868921. The reversal of 216688206868879 is 978868602886612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216688206868879 - 2¹³ = 216688206860687 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216688206868796 and 216688206868805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216688206838879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108344103434439 + 108344103434440.

It is an arithmetic number, because the mean of its divisors is an integer number (108344103434440).

Almost surely, 2^{216688206868879} is an apocalyptic number.

216688206868879 is a deficient number, since it is larger than the sum of its proper divisors (1).

216688206868879 is an equidigital number, since it uses as much as digits as its factorization.

216688206868879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10701766656, while the sum is 85.

The spelling of 216688206868879 in words is "two hundred sixteen trillion, six hundred eighty-eight billion, two hundred six million, eight hundred sixty-eight thousand, eight hundred seventy-nine".