66065687 has 2 divisors, whose sum is σ = 66065688. Its totient is φ = 66065686.

The previous prime is 66065651. The next prime is 66065707. The reversal of 66065687 is 78656066.

66065687 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 not a de Polignac number, because 66065687 - 2⁸ = 66065431 is a prime.

It is equal to p_3899825 and since 66065687 and 3899825 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66065617) 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, 33032843 + 33032844.

It is an arithmetic number, because the mean of its divisors is an integer number (33032844).

Almost surely, 2^66065687 is an apocalyptic number.

66065687 is a deficient number, since it is larger than the sum of its proper divisors (1).

66065687 is an equidigital number, since it uses as much as digits as its factorization.

66065687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 66065687 is about 8128.0801546245. The cubic root of 66065687 is about 404.2580267672.

The spelling of 66065687 in words is "sixty-six million, sixty-five thousand, six hundred eighty-seven".