66540017 has 2 divisors, whose sum is σ = 66540018. Its totient is φ = 66540016.

The previous prime is 66540013. The next prime is 66540029. The reversal of 66540017 is 71004566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62663056 + 3876961 = 7916^2 + 1969^2 .

It is a cyclic number.

It is not a de Polignac number, because 66540017 - 2² = 66540013 is a prime.

It is not a weakly prime, because it can be changed into another prime (66540013) 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, 33270008 + 33270009.

It is an arithmetic number, because the mean of its divisors is an integer number (33270009).

Almost surely, 2^66540017 is an apocalyptic number.

It is an amenable number.

66540017 is a deficient number, since it is larger than the sum of its proper divisors (1).

66540017 is an equidigital number, since it uses as much as digits as its factorization.

66540017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 66540017 is about 8157.2064458367. The cubic root of 66540017 is about 405.2232006490.

The spelling of 66540017 in words is "sixty-six million, five hundred forty thousand, seventeen".