505216507217 has 2 divisors, whose sum is σ = 505216507218. Its totient is φ = 505216507216.

The previous prime is 505216507181. The next prime is 505216507267. The reversal of 505216507217 is 712705612505.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 440682217921 + 64534289296 = 663839^2 + 254036^2 .

It is a cyclic number.

It is not a de Polignac number, because 505216507217 - 2²⁰ = 505215458641 is a prime.

It is not a weakly prime, because it can be changed into another prime (505216507267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252608253608 + 252608253609.

It is an arithmetic number, because the mean of its divisors is an integer number (252608253609).

Almost surely, 2^505216507217 is an apocalyptic number.

It is an amenable number.

505216507217 is a deficient number, since it is larger than the sum of its proper divisors (1).

505216507217 is an equidigital number, since it uses as much as digits as its factorization.

505216507217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 147000, while the sum is 41.

The spelling of 505216507217 in words is "five hundred five billion, two hundred sixteen million, five hundred seven thousand, two hundred seventeen".