2560128656 has 10 divisors (see below), whose sum is σ = 4960249302. Its totient is φ = 1280064320.

The previous prime is 2560128631. The next prime is 2560128661. The reversal of 2560128656 is 6568210652.

It can be written as a sum of positive squares in only one way, i.e., 2554291600 + 5837056 = 50540^2 + 2416^2 .

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 as a sum of consecutive naturals, namely, 80004005 + ... + 80004036.

Almost surely, 2^2560128656 is an apocalyptic number.

It is an amenable number.

2560128656 is a deficient number, since it is larger than the sum of its proper divisors (2400120646).

2560128656 is a wasteful number, since it uses less digits than its factorization.

2560128656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160008049 (or 160008043 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 2560128656 is about 50597.7139404539. The cubic root of 2560128656 is about 1368.0036734851.

The spelling of 2560128656 in words is "two billion, five hundred sixty million, one hundred twenty-eight thousand, six hundred fifty-six".