218782005217 has 2 divisors, whose sum is σ = 218782005218. Its totient is φ = 218782005216.

The previous prime is 218782005199. The next prime is 218782005227. The reversal of 218782005217 is 712500287812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212038146576 + 6743858641 = 460476^2 + 82121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-218782005217 is a prime.

It is not a weakly prime, because it can be changed into another prime (218782005227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109391002608 + 109391002609.

It is an arithmetic number, because the mean of its divisors is an integer number (109391002609).

Almost surely, 2^218782005217 is an apocalyptic number.

It is an amenable number.

218782005217 is a deficient number, since it is larger than the sum of its proper divisors (1).

218782005217 is an equidigital number, since it uses as much as digits as its factorization.

218782005217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125440, while the sum is 43.

The spelling of 218782005217 in words is "two hundred eighteen billion, seven hundred eighty-two million, five thousand, two hundred seventeen".