25564559 has 2 divisors, whose sum is σ = 25564560. Its totient is φ = 25564558.

The previous prime is 25564541. The next prime is 25564571. The reversal of 25564559 is 95546552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25564559 - 2⁸ = 25564303 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25564529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782279 + 12782280.

It is an arithmetic number, because the mean of its divisors is an integer number (12782280).

Almost surely, 2^25564559 is an apocalyptic number.

25564559 is a deficient number, since it is larger than the sum of its proper divisors (1).

25564559 is an equidigital number, since it uses as much as digits as its factorization.

25564559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270000, while the sum is 41.

The square root of 25564559 is about 5056.1407219341. The cubic root of 25564559 is about 294.5864510797.

The spelling of 25564559 in words is "twenty-five million, five hundred sixty-four thousand, five hundred fifty-nine".