66567071 has 2 divisors, whose sum is σ = 66567072. Its totient is φ = 66567070.

The previous prime is 66567049. The next prime is 66567073. The reversal of 66567071 is 17076566.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66567071 is a prime.

Together with 66567073, 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 (66567073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33283535 + 33283536.

It is an arithmetic number, because the mean of its divisors is an integer number (33283536).

Almost surely, 2^66567071 is an apocalyptic number.

66567071 is a deficient number, since it is larger than the sum of its proper divisors (1).

66567071 is an equidigital number, since it uses as much as digits as its factorization.

66567071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 38.

The square root of 66567071 is about 8158.8645656121. The cubic root of 66567071 is about 405.2781120819.

The spelling of 66567071 in words is "sixty-six million, five hundred sixty-seven thousand, seventy-one".