217466743493 has 2 divisors, whose sum is σ = 217466743494. Its totient is φ = 217466743492.

The previous prime is 217466743451. The next prime is 217466743589. The reversal of 217466743493 is 394347664712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201837243169 + 15629500324 = 449263^2 + 125018^2 .

It is a cyclic number.

It is not a de Polignac number, because 217466743493 - 2¹⁴ = 217466727109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217466743393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108733371746 + 108733371747.

It is an arithmetic number, because the mean of its divisors is an integer number (108733371747).

Almost surely, 2^217466743493 is an apocalyptic number.

It is an amenable number.

217466743493 is a deficient number, since it is larger than the sum of its proper divisors (1).

217466743493 is an equidigital number, since it uses as much as digits as its factorization.

217466743493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18289152, while the sum is 56.

The spelling of 217466743493 in words is "two hundred seventeen billion, four hundred sixty-six million, seven hundred forty-three thousand, four hundred ninety-three".