66660071 has 2 divisors, whose sum is σ = 66660072. Its totient is φ = 66660070.

The previous prime is 66660059. The next prime is 66660103. The reversal of 66660071 is 17006666.

It is an a-pointer prime, because the next prime (66660103) can be obtained adding 66660071 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66660071 is a prime.

It is a Chen prime.

It is equal to p_3932924 and since 66660071 and 3932924 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 (66660871) 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, 33330035 + 33330036.

It is an arithmetic number, because the mean of its divisors is an integer number (33330036).

Almost surely, 2^66660071 is an apocalyptic number.

66660071 is a deficient number, since it is larger than the sum of its proper divisors (1).

66660071 is an equidigital number, since it uses as much as digits as its factorization.

66660071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 66660071 is about 8164.5618988406. The cubic root of 66660071 is about 405.4667605382.

The spelling of 66660071 in words is "sixty-six million, six hundred sixty thousand, seventy-one".