25559623 has 2 divisors, whose sum is σ = 25559624. Its totient is φ = 25559622.

The previous prime is 25559543. The next prime is 25559627. The reversal of 25559623 is 32695552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25559623 - 2⁹ = 25559111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25559627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12779811 + 12779812.

It is an arithmetic number, because the mean of its divisors is an integer number (12779812).

Almost surely, 2^25559623 is an apocalyptic number.

25559623 is a deficient number, since it is larger than the sum of its proper divisors (1).

25559623 is an equidigital number, since it uses as much as digits as its factorization.

25559623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 37.

The square root of 25559623 is about 5055.6525790446. The cubic root of 25559623 is about 294.5674902947.

The spelling of 25559623 in words is "twenty-five million, five hundred fifty-nine thousand, six hundred twenty-three".