66533671 has 2 divisors, whose sum is σ = 66533672. Its totient is φ = 66533670.

The previous prime is 66533669. The next prime is 66533681. The reversal of 66533671 is 17633566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66533671 - 2¹ = 66533669 is a prime.

Together with 66533669, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66533671.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66533681) 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, 33266835 + 33266836.

It is an arithmetic number, because the mean of its divisors is an integer number (33266836).

Almost surely, 2^66533671 is an apocalyptic number.

66533671 is a deficient number, since it is larger than the sum of its proper divisors (1).

66533671 is an equidigital number, since it uses as much as digits as its factorization.

66533671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 37.

The square root of 66533671 is about 8156.8174553560. The cubic root of 66533671 is about 405.2103180344.

The spelling of 66533671 in words is "sixty-six million, five hundred thirty-three thousand, six hundred seventy-one".