2565005389 has 2 divisors, whose sum is σ = 2565005390. Its totient is φ = 2565005388.

The previous prime is 2565005371. The next prime is 2565005423. The reversal of 2565005389 is 9835005652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2331924100 + 233081289 = 48290^2 + 15267^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565005389 - 2⁹ = 2565004877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2565005329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282502694 + 1282502695.

It is an arithmetic number, because the mean of its divisors is an integer number (1282502695).

Almost surely, 2^2565005389 is an apocalyptic number.

It is an amenable number.

2565005389 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565005389 is an equidigital number, since it uses as much as digits as its factorization.

2565005389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 43.

The square root of 2565005389 is about 50645.8822511762. The cubic root of 2565005389 is about 1368.8717492697.

The spelling of 2565005389 in words is "two billion, five hundred sixty-five million, five thousand, three hundred eighty-nine".