2568505409 has 2 divisors, whose sum is σ = 2568505410. Its totient is φ = 2568505408.

The previous prime is 2568505327. The next prime is 2568505421. The reversal of 2568505409 is 9045058652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1317327025 + 1251178384 = 36295^2 + 35372^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2568505409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2568505409.

It is not a weakly prime, because it can be changed into another prime (2568505309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1284252704 + 1284252705.

It is an arithmetic number, because the mean of its divisors is an integer number (1284252705).

Almost surely, 2^2568505409 is an apocalyptic number.

It is an amenable number.

2568505409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2568505409 is an equidigital number, since it uses as much as digits as its factorization.

2568505409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432000, while the sum is 44.

The square root of 2568505409 is about 50680.4243174818. The cubic root of 2568505409 is about 1369.4940872688.

The spelling of 2568505409 in words is "two billion, five hundred sixty-eight million, five hundred five thousand, four hundred nine".