25663559 has 2 divisors, whose sum is σ = 25663560. Its totient is φ = 25663558.

The previous prime is 25663541. The next prime is 25663601. The reversal of 25663559 is 95536652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25663559 - 2²⁰ = 24614983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25663159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12831779 + 12831780.

It is an arithmetic number, because the mean of its divisors is an integer number (12831780).

Almost surely, 2^25663559 is an apocalyptic number.

25663559 is a deficient number, since it is larger than the sum of its proper divisors (1).

25663559 is an equidigital number, since it uses as much as digits as its factorization.

25663559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 243000, while the sum is 41.

The square root of 25663559 is about 5065.9213377233. The cubic root of 25663559 is about 294.9662280596.

The spelling of 25663559 in words is "twenty-five million, six hundred sixty-three thousand, five hundred fifty-nine".