217704066511097 has 2 divisors, whose sum is σ = 217704066511098. Its totient is φ = 217704066511096.

The previous prime is 217704066511049. The next prime is 217704066511123. The reversal of 217704066511097 is 790115660407712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215123558402281 + 2580508108816 = 14667091^2 + 1606396^2 .

It is a cyclic number.

It is not a de Polignac number, because 217704066511097 - 2¹² = 217704066507001 is a prime.

It is not a weakly prime, because it can be changed into another prime (217704066571097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108852033255548 + 108852033255549.

It is an arithmetic number, because the mean of its divisors is an integer number (108852033255549).

Almost surely, 2^{217704066511097} is an apocalyptic number.

It is an amenable number.

217704066511097 is a deficient number, since it is larger than the sum of its proper divisors (1).

217704066511097 is an equidigital number, since it uses as much as digits as its factorization.

217704066511097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4445280, while the sum is 56.

The spelling of 217704066511097 in words is "two hundred seventeen trillion, seven hundred four billion, sixty-six million, five hundred eleven thousand, ninety-seven".