2565531256 has 32 divisors (see below), whose sum is σ = 4863870000. Its totient is φ = 1268545536.

The previous prime is 2565531233. The next prime is 2565531301. The reversal of 2565531256 is 6521355652.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 500595 + ... + 505693.

Almost surely, 2^2565531256 is an apocalyptic number.

It is an amenable number.

2565531256 is a deficient number, since it is larger than the sum of its proper divisors (2298338744).

2565531256 is a wasteful number, since it uses less digits than its factorization.

2565531256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791 (or 5787 counting only the distinct ones).

The product of its digits is 270000, while the sum is 40.

The square root of 2565531256 is about 50651.0735917809. The cubic root of 2565531256 is about 1368.9652897220.

The spelling of 2565531256 in words is "two billion, five hundred sixty-five million, five hundred thirty-one thousand, two hundred fifty-six".