66530617 has 4 divisors (see below), whose sum is σ = 66562596. Its totient is φ = 66498640.

The previous prime is 66530603. The next prime is 66530623. The reversal of 66530617 is 71603566.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71603566 = 2 ⋅35801783.

It can be written as a sum of positive squares in 2 ways, for example, as 56265001 + 10265616 = 7501^2 + 3204^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66530617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66530627) 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 in 3 ways as a sum of consecutive naturals, for example, 12634 + ... + 17107.

It is an arithmetic number, because the mean of its divisors is an integer number (16640649).

Almost surely, 2^66530617 is an apocalyptic number.

It is an amenable number.

66530617 is a deficient number, since it is larger than the sum of its proper divisors (31979).

66530617 is a wasteful number, since it uses less digits than its factorization.

66530617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31978.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66530617 is about 8156.6302478413. The cubic root of 66530617 is about 405.2041180095.

The spelling of 66530617 in words is "sixty-six million, five hundred thirty thousand, six hundred seventeen".