66543017 has 2 divisors, whose sum is σ = 66543018. Its totient is φ = 66543016.

The previous prime is 66543011. The next prime is 66543031. The reversal of 66543017 is 71034566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59274601 + 7268416 = 7699^2 + 2696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66543017 is a prime.

It is a super-2 number, since 2×66543017² = 8855946222924578, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66543011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33271508 + 33271509.

It is an arithmetic number, because the mean of its divisors is an integer number (33271509).

Almost surely, 2^66543017 is an apocalyptic number.

It is an amenable number.

66543017 is a deficient number, since it is larger than the sum of its proper divisors (1).

66543017 is an equidigital number, since it uses as much as digits as its factorization.

66543017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66543017 is about 8157.3903302466. The cubic root of 66543017 is about 405.2292904748.

The spelling of 66543017 in words is "sixty-six million, five hundred forty-three thousand, seventeen".