66027997171 has 2 divisors, whose sum is σ = 66027997172. Its totient is φ = 66027997170.

The previous prime is 66027997169. The next prime is 66027997187. The reversal of 66027997171 is 17179972066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66027997171 - 2¹ = 66027997169 is a prime.

Together with 66027997169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66027997111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33013998585 + 33013998586.

It is an arithmetic number, because the mean of its divisors is an integer number (33013998586).

Almost surely, 2^66027997171 is an apocalyptic number.

66027997171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66027997171 is an equidigital number, since it uses as much as digits as its factorization.

66027997171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2000376, while the sum is 55.

The spelling of 66027997171 in words is "sixty-six billion, twenty-seven million, nine hundred ninety-seven thousand, one hundred seventy-one".