66710291 has 2 divisors, whose sum is σ = 66710292. Its totient is φ = 66710290.

The previous prime is 66710279. The next prime is 66710323. The reversal of 66710291 is 19201766.

It is a happy number.

It is an a-pointer prime, because the next prime (66710323) can be obtained adding 66710291 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66710291 - 2¹⁰ = 66709267 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66710221) 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, 33355145 + 33355146.

It is an arithmetic number, because the mean of its divisors is an integer number (33355146).

Almost surely, 2^66710291 is an apocalyptic number.

66710291 is a deficient number, since it is larger than the sum of its proper divisors (1).

66710291 is an equidigital number, since it uses as much as digits as its factorization.

66710291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 66710291 is about 8167.6368063229. The cubic root of 66710291 is about 405.5685577561.

The spelling of 66710291 in words is "sixty-six million, seven hundred ten thousand, two hundred ninety-one".