216707541209 has 2 divisors, whose sum is σ = 216707541210. Its totient is φ = 216707541208.

The previous prime is 216707541187. The next prime is 216707541229. The reversal of 216707541209 is 902145707612.

216707541209 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 can be written as a sum of positive squares in only one way, i.e., 136308640000 + 80398901209 = 369200^2 + 283547^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216707541209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216707541209.

It is not a weakly prime, because it can be changed into another prime (216707541229) 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, 108353770604 + 108353770605.

It is an arithmetic number, because the mean of its divisors is an integer number (108353770605).

Almost surely, 2^216707541209 is an apocalyptic number.

It is an amenable number.

216707541209 is a deficient number, since it is larger than the sum of its proper divisors (1).

216707541209 is an equidigital number, since it uses as much as digits as its factorization.

216707541209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 211680, while the sum is 44.

The spelling of 216707541209 in words is "two hundred sixteen billion, seven hundred seven million, five hundred forty-one thousand, two hundred nine".