2556512563 has 6 divisors (see below), whose sum is σ = 2810051132. Its totient is φ = 2324102220.

The previous prime is 2556512551. The next prime is 2556512627. The reversal of 2556512563 is 3652156552.

It is a happy number.

It is not a de Polignac number, because 2556512563 - 2¹³ = 2556504371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2506512563) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 10563981 + ... + 10564222.

Almost surely, 2^2556512563 is an apocalyptic number.

2556512563 is a deficient number, since it is larger than the sum of its proper divisors (253538569).

2556512563 is a wasteful number, since it uses less digits than its factorization.

2556512563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21128225 (or 21128214 counting only the distinct ones).

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

The square root of 2556512563 is about 50561.9675546749. The cubic root of 2556512563 is about 1367.3592840713.

The spelling of 2556512563 in words is "two billion, five hundred fifty-six million, five hundred twelve thousand, five hundred sixty-three".