25566439 has 2 divisors, whose sum is σ = 25566440. Its totient is φ = 25566438.

The previous prime is 25566427. The next prime is 25566451. The reversal of 25566439 is 93466552.

It is a balanced prime because it is at equal distance from previous prime (25566427) and next prime (25566451).

It is a cyclic number.

It is not a de Polignac number, because 25566439 - 2¹⁷ = 25435367 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25566469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12783219 + 12783220.

It is an arithmetic number, because the mean of its divisors is an integer number (12783220).

Almost surely, 2^25566439 is an apocalyptic number.

25566439 is a deficient number, since it is larger than the sum of its proper divisors (1).

25566439 is an equidigital number, since it uses as much as digits as its factorization.

25566439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 40.

The square root of 25566439 is about 5056.3266310633. The cubic root of 25566439 is about 294.5936721307.

The spelling of 25566439 in words is "twenty-five million, five hundred sixty-six thousand, four hundred thirty-nine".