2218508217109 has 2 divisors, whose sum is σ = 2218508217110. Its totient is φ = 2218508217108.

The previous prime is 2218508217089. The next prime is 2218508217209. The reversal of 2218508217109 is 9017128058122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1244793184209 + 973715032900 = 1115703^2 + 986770^2 .

It is a cyclic number.

It is not a de Polignac number, because 2218508217109 - 2¹⁵ = 2218508184341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2218508217209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1109254108554 + 1109254108555.

It is an arithmetic number, because the mean of its divisors is an integer number (1109254108555).

Almost surely, 2^{2218508217109} is an apocalyptic number.

It is an amenable number.

2218508217109 is a deficient number, since it is larger than the sum of its proper divisors (1).

2218508217109 is an equidigital number, since it uses as much as digits as its factorization.

2218508217109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 46.

The spelling of 2218508217109 in words is "two trillion, two hundred eighteen billion, five hundred eight million, two hundred seventeen thousand, one hundred nine".