25646563 has 2 divisors, whose sum is σ = 25646564. Its totient is φ = 25646562.

The previous prime is 25646531. The next prime is 25646567. The reversal of 25646563 is 36564652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25646563 - 2⁵ = 25646531 is a prime.

It is not a weakly prime, because it can be changed into another prime (25646567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12823281 + 12823282.

It is an arithmetic number, because the mean of its divisors is an integer number (12823282).

Almost surely, 2^25646563 is an apocalyptic number.

25646563 is a deficient number, since it is larger than the sum of its proper divisors (1).

25646563 is an equidigital number, since it uses as much as digits as its factorization.

25646563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 37.

The square root of 25646563 is about 5064.2435762905. The cubic root of 25646563 is about 294.9010987049.

The spelling of 25646563 in words is "twenty-five million, six hundred forty-six thousand, five hundred sixty-three".