6565155656 has 16 divisors (see below), whose sum is σ = 12313813740. Its totient is φ = 3281472000.

The previous prime is 6565155631. The next prime is 6565155697. The reversal of 6565155656 is 6565515656.

It can be written as a sum of positive squares in 2 ways, for example, as 6032007556 + 533148100 = 77666^2 + 23090^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112721 + ... + 160736.

Almost surely, 2^6565155656 is an apocalyptic number.

It is an amenable number.

6565155656 is a deficient number, since it is larger than the sum of its proper divisors (5748658084).

6565155656 is a wasteful number, since it uses less digits than its factorization.

6565155656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276464 (or 276460 counting only the distinct ones).

The product of its digits is 4050000, while the sum is 50.

The square root of 6565155656 is about 81025.6481368708. The cubic root of 6565155656 is about 1872.4706071133.

Subtracting 6565155656 from its reverse (6565515656), we obtain a square (360000 = 600²).

The spelling of 6565155656 in words is "six billion, five hundred sixty-five million, one hundred fifty-five thousand, six hundred fifty-six".