6560661256 has 32 divisors (see below), whose sum is σ = 12486740760. Its totient is φ = 3230986752.

The previous prime is 6560661241. The next prime is 6560661257. The reversal of 6560661256 is 6521660656.

It can be written as a sum of positive squares in 4 ways, for example, as 4547344356 + 2013316900 = 67434^2 + 44870^2 .

It is a super-2 number, since 2×6560661256² = 86084552231958995072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6560661257) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 444166 + ... + 458698.

Almost surely, 2^6560661256 is an apocalyptic number.

It is an amenable number.

6560661256 is a deficient number, since it is larger than the sum of its proper divisors (5926079504).

6560661256 is a wasteful number, since it uses less digits than its factorization.

6560661256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15385 (or 15381 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

The square root of 6560661256 is about 80997.9089606639. The cubic root of 6560661256 is about 1872.0432218148.

The spelling of 6560661256 in words is "six billion, five hundred sixty million, six hundred sixty-one thousand, two hundred fifty-six".