2565524561 has 2 divisors, whose sum is σ = 2565524562. Its totient is φ = 2565524560.

The previous prime is 2565524543. The next prime is 2565524569. The reversal of 2565524561 is 1654255652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1739307025 + 826217536 = 41705^2 + 28744^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2565524561 is a prime.

It is not a weakly prime, because it can be changed into another prime (2565524569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282762280 + 1282762281.

It is an arithmetic number, because the mean of its divisors is an integer number (1282762281).

Almost surely, 2^2565524561 is an apocalyptic number.

It is an amenable number.

2565524561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565524561 is an equidigital number, since it uses as much as digits as its factorization.

2565524561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360000, while the sum is 41.

The square root of 2565524561 is about 50651.0075023192. The cubic root of 2565524561 is about 1368.9640989055.

The spelling of 2565524561 in words is "two billion, five hundred sixty-five million, five hundred twenty-four thousand, five hundred sixty-one".