6665171011117 has 4 divisors (see below), whose sum is σ = 6670025470620. Its totient is φ = 6660316551616.

The previous prime is 6665171011087. The next prime is 6665171011157. The reversal of 6665171011117 is 7111101715666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6088329242116 + 576841769001 = 2467454^2 + 759501^2 .

It is a cyclic number.

It is not a de Polignac number, because 6665171011117 - 2³⁵ = 6630811272749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665171011157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2427227692 + ... + 2427230437.

It is an arithmetic number, because the mean of its divisors is an integer number (1667506367655).

Almost surely, 2^{6665171011117} is an apocalyptic number.

It is an amenable number.

6665171011117 is a deficient number, since it is larger than the sum of its proper divisors (4854459503).

6665171011117 is a wasteful number, since it uses less digits than its factorization.

6665171011117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4854459502.

The product of its (nonzero) digits is 52920, while the sum is 43.

The spelling of 6665171011117 in words is "six trillion, six hundred sixty-five billion, one hundred seventy-one million, eleven thousand, one hundred seventeen".