217628328171 has 16 divisors (see below), whose sum is σ = 312276718368. Its totient is φ = 134312563200.

The previous prime is 217628328157. The next prime is 217628328227. The reversal of 217628328171 is 171823826712.

217628328171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 217628328171 - 2²¹ = 217626231019 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 217628328171.

It is not an unprimeable number, because it can be changed into a prime (217628328271) 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 in 15 ways as a sum of consecutive naturals, for example, 34974120 + ... + 34980341.

It is an arithmetic number, because the mean of its divisors is an integer number (19517294898).

Almost surely, 2^217628328171 is an apocalyptic number.

217628328171 is a deficient number, since it is larger than the sum of its proper divisors (94648390197).

217628328171 is a wasteful number, since it uses less digits than its factorization.

217628328171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69954542.

The product of its digits is 451584, while the sum is 48.

The spelling of 217628328171 in words is "two hundred seventeen billion, six hundred twenty-eight million, three hundred twenty-eight thousand, one hundred seventy-one".