217664300473 has 2 divisors, whose sum is σ = 217664300474. Its totient is φ = 217664300472.

The previous prime is 217664300471. The next prime is 217664300507. The reversal of 217664300473 is 374003466712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217129904784 + 534395689 = 465972^2 + 23117^2 .

It is a cyclic number.

It is not a de Polignac number, because 217664300473 - 2¹ = 217664300471 is a prime.

Together with 217664300471, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (217664300471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108832150236 + 108832150237.

It is an arithmetic number, because the mean of its divisors is an integer number (108832150237).

Almost surely, 2^217664300473 is an apocalyptic number.

It is an amenable number.

217664300473 is a deficient number, since it is larger than the sum of its proper divisors (1).

217664300473 is an equidigital number, since it uses as much as digits as its factorization.

217664300473 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 43.

The spelling of 217664300473 in words is "two hundred seventeen billion, six hundred sixty-four million, three hundred thousand, four hundred seventy-three".