217550055713 has 2 divisors, whose sum is σ = 217550055714. Its totient is φ = 217550055712.

The previous prime is 217550055631. The next prime is 217550055757. The reversal of 217550055713 is 317550055712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206795743504 + 10754312209 = 454748^2 + 103703^2 .

It is a cyclic number.

It is not a de Polignac number, because 217550055713 - 2²⁴ = 217533278497 is a prime.

It is not a weakly prime, because it can be changed into another prime (217550055763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108775027856 + 108775027857.

It is an arithmetic number, because the mean of its divisors is an integer number (108775027857).

Almost surely, 2^217550055713 is an apocalyptic number.

It is an amenable number.

217550055713 is a deficient number, since it is larger than the sum of its proper divisors (1).

217550055713 is an equidigital number, since it uses as much as digits as its factorization.

217550055713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183750, while the sum is 41.

Subtracting 217550055713 from its reverse (317550055712), we obtain a palindrome (99999999999).

The spelling of 217550055713 in words is "two hundred seventeen billion, five hundred fifty million, fifty-five thousand, seven hundred thirteen".