66711371 has 2 divisors, whose sum is σ = 66711372. Its totient is φ = 66711370.

The previous prime is 66711343. The next prime is 66711373. The reversal of 66711371 is 17311766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66711371 is a prime.

It is a Sophie Germain prime.

Together with 66711373, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66711373) 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, 33355685 + 33355686.

It is an arithmetic number, because the mean of its divisors is an integer number (33355686).

Almost surely, 2^66711371 is an apocalyptic number.

66711371 is a deficient number, since it is larger than the sum of its proper divisors (1).

66711371 is an equidigital number, since it uses as much as digits as its factorization.

66711371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 32.

The square root of 66711371 is about 8167.7029206503. The cubic root of 66711371 is about 405.5707463823.

The spelling of 66711371 in words is "sixty-six million, seven hundred eleven thousand, three hundred seventy-one".