66516027008171 has 8 divisors (see below), whose sum is σ = 71635958491104. Its totient is φ = 61396568956800.

The previous prime is 66516027008153. The next prime is 66516027008177. The reversal of 66516027008171 is 17180072061566.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66516027008171 - 2¹⁸ = 66516026746027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66516027008177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118066055 + ... + 118628096.

It is an arithmetic number, because the mean of its divisors is an integer number (8954494811388).

Almost surely, 2^{66516027008171} is an apocalyptic number.

66516027008171 is a deficient number, since it is larger than the sum of its proper divisors (5119931482933).

66516027008171 is a wasteful number, since it uses less digits than its factorization.

66516027008171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236715781.

The product of its (nonzero) digits is 846720, while the sum is 50.

The spelling of 66516027008171 in words is "sixty-six trillion, five hundred sixteen billion, twenty-seven million, eight thousand, one hundred seventy-one".