66065218207171 has 4 divisors (see below), whose sum is σ = 66065242852312. Its totient is φ = 66065193562032.

The previous prime is 66065218207159. The next prime is 66065218207207. The reversal of 66065218207171 is 17170281256066.

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

It is a cyclic number.

It is not a de Polignac number, because 66065218207171 - 2⁵ = 66065218207139 is a prime.

It is a super-2 number, since 2×66065218207171² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66065218207141) 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, 7731381 + ... + 13852966.

It is an arithmetic number, because the mean of its divisors is an integer number (16516310713078).

Almost surely, 2^{66065218207171} is an apocalyptic number.

66065218207171 is a deficient number, since it is larger than the sum of its proper divisors (24645141).

66065218207171 is a wasteful number, since it uses less digits than its factorization.

66065218207171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24645140.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 66065218207171 in words is "sixty-six trillion, sixty-five billion, two hundred eighteen million, two hundred seven thousand, one hundred seventy-one".