66695171 has 2 divisors, whose sum is σ = 66695172. Its totient is φ = 66695170.

The previous prime is 66695141. The next prime is 66695173. The reversal of 66695171 is 17159666.

66695171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66695171 is a prime.

Together with 66695173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66695173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33347585 + 33347586.

It is an arithmetic number, because the mean of its divisors is an integer number (33347586).

Almost surely, 2^66695171 is an apocalyptic number.

66695171 is a deficient number, since it is larger than the sum of its proper divisors (1).

66695171 is an equidigital number, since it uses as much as digits as its factorization.

66695171 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 66695171 is about 8166.7111495387. The cubic root of 66695171 is about 405.5379145083.

It can be divided in two parts, 66695 and 171, that added together give a palindrome (66866).

The spelling of 66695171 in words is "sixty-six million, six hundred ninety-five thousand, one hundred seventy-one".