217140966171 has 6 divisors (see below), whose sum is σ = 313648062260. Its totient is φ = 144760644108.

The previous prime is 217140966169. The next prime is 217140966199. The reversal of 217140966171 is 171669041712.

217140966171 is a `hidden beast` number, since 2 + 1 + 71 + 409 + 6 + 6 + 171 = 666.

217140966171 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 217140966171 - 2¹ = 217140966169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217140966151) 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 5 ways as a sum of consecutive naturals, for example, 12063387001 + ... + 12063387018.

Almost surely, 2^217140966171 is an apocalyptic number.

217140966171 is a deficient number, since it is larger than the sum of its proper divisors (96507096089).

217140966171 is a wasteful number, since it uses less digits than its factorization.

217140966171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24126774025 (or 24126774022 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 217140966171 in words is "two hundred seventeen billion, one hundred forty million, nine hundred sixty-six thousand, one hundred seventy-one".