66665327 has 2 divisors, whose sum is σ = 66665328.
Its totient is φ = 66665326.
The previous prime is 66665323. The next prime is 66665329. The reversal of 66665327 is 72356666.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 66665327 - 22 = 66665323 is a prime.
Together with 66665329, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (66665321) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33332663 + 33332664.
It is an arithmetic number, because the mean of its divisors is an integer number (33332664).
Almost surely, 266665327 is an apocalyptic number.
66665327 is a deficient number, since it is larger than the sum of its proper divisors (1).
66665327 is an equidigital number, since it uses as much as digits as its factorization.
66665327 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 272160, while the sum is 41.
The square root of 66665327 is about 8164.8837713712.
The cubic root of 66665327 is about 405.4774169789.
The spelling of 66665327 in words is "sixty-six million, six hundred sixty-five thousand, three hundred twenty-seven".