66318871 has 2 divisors, whose sum is σ = 66318872. Its totient is φ = 66318870.

The previous prime is 66318839. The next prime is 66318883. The reversal of 66318871 is 17881366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66318871 - 2⁵ = 66318839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66318271) 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, 33159435 + 33159436.

It is an arithmetic number, because the mean of its divisors is an integer number (33159436).

Almost surely, 2^66318871 is an apocalyptic number.

66318871 is a deficient number, since it is larger than the sum of its proper divisors (1).

66318871 is an equidigital number, since it uses as much as digits as its factorization.

66318871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 40.

The square root of 66318871 is about 8143.6399109980. The cubic root of 66318871 is about 404.7737821156.

The spelling of 66318871 in words is "sixty-six million, three hundred eighteen thousand, eight hundred seventy-one".