217450113215609 has 2 divisors, whose sum is σ = 217450113215610. Its totient is φ = 217450113215608.

The previous prime is 217450113215497. The next prime is 217450113215611. The reversal of 217450113215609 is 906512311054712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205196227907584 + 12253885308025 = 14324672^2 + 3500555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217450113215609 is a prime.

Together with 217450113215611, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (217450113245609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108725056607804 + 108725056607805.

It is an arithmetic number, because the mean of its divisors is an integer number (108725056607805).

Almost surely, 2^{217450113215609} is an apocalyptic number.

It is an amenable number.

217450113215609 is a deficient number, since it is larger than the sum of its proper divisors (1).

217450113215609 is an equidigital number, since it uses as much as digits as its factorization.

217450113215609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 453600, while the sum is 47.

The spelling of 217450113215609 in words is "two hundred seventeen trillion, four hundred fifty billion, one hundred thirteen million, two hundred fifteen thousand, six hundred nine".