66247271 has 2 divisors, whose sum is σ = 66247272. Its totient is φ = 66247270.

The previous prime is 66247253. The next prime is 66247277. The reversal of 66247271 is 17274266.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66247271 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66247277) 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, 33123635 + 33123636.

It is an arithmetic number, because the mean of its divisors is an integer number (33123636).

Almost surely, 2^66247271 is an apocalyptic number.

66247271 is a deficient number, since it is larger than the sum of its proper divisors (1).

66247271 is an equidigital number, since it uses as much as digits as its factorization.

66247271 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 35.

The square root of 66247271 is about 8139.2426551860. The cubic root of 66247271 is about 404.6280607016.

The spelling of 66247271 in words is "sixty-six million, two hundred forty-seven thousand, two hundred seventy-one".