6565061666 has 8 divisors (see below), whose sum is σ = 10426862700. Its totient is φ = 3089440768.

The previous prime is 6565061639. The next prime is 6565061669. The reversal of 6565061666 is 6661605656.

It can be written as a sum of positive squares in 2 ways, for example, as 6139506025 + 425555641 = 78355^2 + 20629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6565061666.

It is not an unprimeable number, because it can be changed into a prime (6565061669) 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, 96544991 + ... + 96545058.

Almost surely, 2^6565061666 is an apocalyptic number.

6565061666 is a deficient number, since it is larger than the sum of its proper divisors (3861801034).

6565061666 is a wasteful number, since it uses less digits than its factorization.

6565061666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193090068.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The square root of 6565061666 is about 81025.0681332635. The cubic root of 6565061666 is about 1872.4616713337.

The spelling of 6565061666 in words is "six billion, five hundred sixty-five million, sixty-one thousand, six hundred sixty-six".