217325784329 has 2 divisors, whose sum is σ = 217325784330. Its totient is φ = 217325784328.

The previous prime is 217325784307. The next prime is 217325784349. The reversal of 217325784329 is 923487523712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202655729929 + 14670054400 = 450173^2 + 121120^2 .

It is a cyclic number.

It is not a de Polignac number, because 217325784329 - 2²⁸ = 217057348873 is a prime.

It is not a weakly prime, because it can be changed into another prime (217325784349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108662892164 + 108662892165.

It is an arithmetic number, because the mean of its divisors is an integer number (108662892165).

Almost surely, 2^217325784329 is an apocalyptic number.

It is an amenable number.

217325784329 is a deficient number, since it is larger than the sum of its proper divisors (1).

217325784329 is an equidigital number, since it uses as much as digits as its factorization.

217325784329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5080320, while the sum is 53.

The spelling of 217325784329 in words is "two hundred seventeen billion, three hundred twenty-five million, seven hundred eighty-four thousand, three hundred twenty-nine".