66351317 has 2 divisors, whose sum is σ = 66351318. Its totient is φ = 66351316.

The previous prime is 66351301. The next prime is 66351319. The reversal of 66351317 is 71315366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62315236 + 4036081 = 7894^2 + 2009^2 .

It is a cyclic number.

It is not a de Polignac number, because 66351317 - 2⁴ = 66351301 is a prime.

Together with 66351319, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3915752 and since 66351317 and 3915752 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 (66351319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33175658 + 33175659.

It is an arithmetic number, because the mean of its divisors is an integer number (33175659).

Almost surely, 2^66351317 is an apocalyptic number.

It is an amenable number.

66351317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66351317 is an equidigital number, since it uses as much as digits as its factorization.

66351317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 32.

The square root of 66351317 is about 8145.6317741474. The cubic root of 66351317 is about 404.8397821783.

The spelling of 66351317 in words is "sixty-six million, three hundred fifty-one thousand, three hundred seventeen".