66599317 has 2 divisors, whose sum is σ = 66599318. Its totient is φ = 66599316.

The previous prime is 66599263. The next prime is 66599333. The reversal of 66599317 is 71399566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51279921 + 15319396 = 7161^2 + 3914^2 .

It is a cyclic number.

It is not a de Polignac number, because 66599317 - 2⁷ = 66599189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66599347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33299658 + 33299659.

It is an arithmetic number, because the mean of its divisors is an integer number (33299659).

Almost surely, 2^66599317 is an apocalyptic number.

It is an amenable number.

66599317 is a deficient number, since it is larger than the sum of its proper divisors (1).

66599317 is an equidigital number, since it uses as much as digits as its factorization.

66599317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 46.

The square root of 66599317 is about 8160.8404591684. The cubic root of 66599317 is about 405.3435422722.

The spelling of 66599317 in words is "sixty-six million, five hundred ninety-nine thousand, three hundred seventeen".