217285488647 has 2 divisors, whose sum is σ = 217285488648. Its totient is φ = 217285488646.

The previous prime is 217285488587. The next prime is 217285488683. The reversal of 217285488647 is 746884582712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 217285488647 - 2¹⁴ = 217285472263 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217285488647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217285488697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108642744323 + 108642744324.

It is an arithmetic number, because the mean of its divisors is an integer number (108642744324).

Almost surely, 2^217285488647 is an apocalyptic number.

217285488647 is a deficient number, since it is larger than the sum of its proper divisors (1).

217285488647 is an equidigital number, since it uses as much as digits as its factorization.

217285488647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48168960, while the sum is 62.

The spelling of 217285488647 in words is "two hundred seventeen billion, two hundred eighty-five million, four hundred eighty-eight thousand, six hundred forty-seven".