665066605 has 16 divisors (see below), whose sum is σ = 965744640. Its totient is φ = 429219072.

The previous prime is 665066593. The next prime is 665066621. The reversal of 665066605 is 506660566.

It is a happy number.

665066605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 665066605 - 2¹¹ = 665064557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558285 + ... + 559474.

It is an arithmetic number, because the mean of its divisors is an integer number (60359040).

Almost surely, 2^665066605 is an apocalyptic number.

It is an amenable number.

665066605 is a deficient number, since it is larger than the sum of its proper divisors (300678035).

665066605 is a wasteful number, since it uses less digits than its factorization.

665066605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117788.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 665066605 is about 25788.8852996790. The cubic root of 665066605 is about 872.8810135478.

The spelling of 665066605 in words is "six hundred sixty-five million, sixty-six thousand, six hundred five".