216668777031199 has 2 divisors, whose sum is σ = 216668777031200. Its totient is φ = 216668777031198.

The previous prime is 216668777031167. The next prime is 216668777031227. The reversal of 216668777031199 is 991130777866612.

216668777031199 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216668777031199 - 2⁵ = 216668777031167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216668777031799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108334388515599 + 108334388515600.

It is an arithmetic number, because the mean of its divisors is an integer number (108334388515600).

Almost surely, 2^{216668777031199} is an apocalyptic number.

216668777031199 is a deficient number, since it is larger than the sum of its proper divisors (1).

216668777031199 is an equidigital number, since it uses as much as digits as its factorization.

216668777031199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288054144, while the sum is 73.

The spelling of 216668777031199 in words is "two hundred sixteen trillion, six hundred sixty-eight billion, seven hundred seventy-seven million, thirty-one thousand, one hundred ninety-nine".