25641563 has 2 divisors, whose sum is σ = 25641564. Its totient is φ = 25641562.

The previous prime is 25641529. The next prime is 25641589. The reversal of 25641563 is 36514652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25641563 - 2¹⁴ = 25625179 is a prime.

It is not a weakly prime, because it can be changed into another prime (25641163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820781 + 12820782.

It is an arithmetic number, because the mean of its divisors is an integer number (12820782).

Almost surely, 2^25641563 is an apocalyptic number.

25641563 is a deficient number, since it is larger than the sum of its proper divisors (1).

25641563 is an equidigital number, since it uses as much as digits as its factorization.

25641563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 32.

The square root of 25641563 is about 5063.7498950876. The cubic root of 25641563 is about 294.8819330266.

The spelling of 25641563 in words is "twenty-five million, six hundred forty-one thousand, five hundred sixty-three".