65566607 has 4 divisors (see below), whose sum is σ = 66203280. Its totient is φ = 64929936.

The previous prime is 65566577. The next prime is 65566609. The reversal of 65566607 is 70666556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 65566607 - 2²⁰ = 64518031 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 (65566609) 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, 318182 + ... + 318387.

It is an arithmetic number, because the mean of its divisors is an integer number (16550820).

Almost surely, 2^65566607 is an apocalyptic number.

65566607 is a deficient number, since it is larger than the sum of its proper divisors (636673).

65566607 is a wasteful number, since it uses less digits than its factorization.

65566607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636672.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 65566607 is about 8097.3209767182. The cubic root of 65566607 is about 403.2374905268.

The spelling of 65566607 in words is "sixty-five million, five hundred sixty-six thousand, six hundred seven".