66008917 has 4 divisors (see below), whose sum is σ = 71086540. Its totient is φ = 60931296.

The previous prime is 66008911. The next prime is 66008927. The reversal of 66008917 is 71980066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71980066 = 2 ⋅35990033.

It can be written as a sum of positive squares in 2 ways, for example, as 44609041 + 21399876 = 6679^2 + 4626^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66008917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66008911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2538792 + ... + 2538817.

It is an arithmetic number, because the mean of its divisors is an integer number (17771635).

Almost surely, 2^66008917 is an apocalyptic number.

It is an amenable number.

66008917 is a deficient number, since it is larger than the sum of its proper divisors (5077623).

66008917 is a wasteful number, since it uses less digits than its factorization.

66008917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5077622.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 66008917 is about 8124.5871895131. The cubic root of 66008917 is about 404.1422011099.

The spelling of 66008917 in words is "sixty-six million, eight thousand, nine hundred seventeen".