217171473045487 has 2 divisors, whose sum is σ = 217171473045488. Its totient is φ = 217171473045486.

The previous prime is 217171473045419. The next prime is 217171473045503. The reversal of 217171473045487 is 784540374171712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217171473045487 - 2¹⁵ = 217171473012719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217171473045587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108585736522743 + 108585736522744.

It is an arithmetic number, because the mean of its divisors is an integer number (108585736522744).

Almost surely, 2^{217171473045487} is an apocalyptic number.

217171473045487 is a deficient number, since it is larger than the sum of its proper divisors (1).

217171473045487 is an equidigital number, since it uses as much as digits as its factorization.

217171473045487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36879360, while the sum is 61.

The spelling of 217171473045487 in words is "two hundred seventeen trillion, one hundred seventy-one billion, four hundred seventy-three million, forty-five thousand, four hundred eighty-seven".