2565002509 has 2 divisors, whose sum is σ = 2565002510. Its totient is φ = 2565002508.

The previous prime is 2565002507. The next prime is 2565002519. The reversal of 2565002509 is 9052005652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1787429284 + 777573225 = 42278^2 + 27885^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565002509 - 2¹ = 2565002507 is a prime.

Together with 2565002507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565002501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282501254 + 1282501255.

It is an arithmetic number, because the mean of its divisors is an integer number (1282501255).

Almost surely, 2^2565002509 is an apocalyptic number.

It is an amenable number.

2565002509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565002509 is an equidigital number, since it uses as much as digits as its factorization.

2565002509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 2565002509 is about 50645.8538184519. The cubic root of 2565002509 is about 1368.8712369443.

The spelling of 2565002509 in words is "two billion, five hundred sixty-five million, two thousand, five hundred nine".