216717331573 has 2 divisors, whose sum is σ = 216717331574. Its totient is φ = 216717331572.

The previous prime is 216717331511. The next prime is 216717331591. The reversal of 216717331573 is 375133717612.

216717331573 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 134243830449 + 82473501124 = 366393^2 + 287182^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216717331573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216717361573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108358665786 + 108358665787.

It is an arithmetic number, because the mean of its divisors is an integer number (108358665787).

Almost surely, 2^216717331573 is an apocalyptic number.

It is an amenable number.

216717331573 is a deficient number, since it is larger than the sum of its proper divisors (1).

216717331573 is an equidigital number, since it uses as much as digits as its factorization.

216717331573 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 555660, while the sum is 46.

The spelling of 216717331573 in words is "two hundred sixteen billion, seven hundred seventeen million, three hundred thirty-one thousand, five hundred seventy-three".