66513017 has 2 divisors, whose sum is σ = 66513018. Its totient is φ = 66513016.

The previous prime is 66512989. The next prime is 66513047. The reversal of 66513017 is 71031566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59228416 + 7284601 = 7696^2 + 2699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66513017 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66513047) 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, 33256508 + 33256509.

It is an arithmetic number, because the mean of its divisors is an integer number (33256509).

Almost surely, 2^66513017 is an apocalyptic number.

It is an amenable number.

66513017 is a deficient number, since it is larger than the sum of its proper divisors (1).

66513017 is an equidigital number, since it uses as much as digits as its factorization.

66513017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 66513017 is about 8155.5512995750. The cubic root of 66513017 is about 405.1683839783.

The spelling of 66513017 in words is "sixty-six million, five hundred thirteen thousand, seventeen".