66085871 has 2 divisors, whose sum is σ = 66085872. Its totient is φ = 66085870.

The previous prime is 66085843. The next prime is 66085879. The reversal of 66085871 is 17858066.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66085871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66085879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33042935 + 33042936.

It is an arithmetic number, because the mean of its divisors is an integer number (33042936).

Almost surely, 2^66085871 is an apocalyptic number.

66085871 is a deficient number, since it is larger than the sum of its proper divisors (1).

66085871 is an equidigital number, since it uses as much as digits as its factorization.

66085871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 66085871 is about 8129.3216814197. The cubic root of 66085871 is about 404.2991914200.

The spelling of 66085871 in words is "sixty-six million, eighty-five thousand, eight hundred seventy-one".