6565665646 has 8 divisors (see below), whose sum is σ = 10166192064. Its totient is φ = 3176934960.

The previous prime is 6565665619. The next prime is 6565665647. The reversal of 6565665646 is 6465665656.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6565665647) 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, 52948855 + ... + 52948978.

It is an arithmetic number, because the mean of its divisors is an integer number (1270774008).

Almost surely, 2^6565665646 is an apocalyptic number.

6565665646 is a deficient number, since it is larger than the sum of its proper divisors (3600526418).

6565665646 is a wasteful number, since it uses less digits than its factorization.

6565665646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105897866.

The product of its digits is 23328000, while the sum is 55.

The square root of 6565665646 is about 81028.7951656693. The cubic root of 6565665646 is about 1872.5190911914.

The spelling of 6565665646 in words is "six billion, five hundred sixty-five million, six hundred sixty-five thousand, six hundred forty-six".