6564943215171 has 36 divisors (see below), whose sum is σ = 10423832989024. Its totient is φ = 3978484503840.

The previous prime is 6564943215137. The next prime is 6564943215203. The reversal of 6564943215171 is 1715123494656.

6564943215171 is a `hidden beast` number, since 6 + 5 + 6 + 4 + 94 + 32 + 1 + 517 + 1 = 666.

It is not a de Polignac number, because 6564943215171 - 2⁶ = 6564943215107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6564943215101) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16545126 + ... + 16937268.

Almost surely, 2^{6564943215171} is an apocalyptic number.

6564943215171 is a deficient number, since it is larger than the sum of its proper divisors (3858889773853).

6564943215171 is a wasteful number, since it uses less digits than its factorization.

6564943215171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407544 (or 407530 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 6564943215171 in words is "six trillion, five hundred sixty-four billion, nine hundred forty-three million, two hundred fifteen thousand, one hundred seventy-one".