25643263 has 2 divisors, whose sum is σ = 25643264. Its totient is φ = 25643262.

The previous prime is 25643251. The next prime is 25643291. The reversal of 25643263 is 36234652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25643263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25643063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12821631 + 12821632.

It is an arithmetic number, because the mean of its divisors is an integer number (12821632).

Almost surely, 2^25643263 is an apocalyptic number.

25643263 is a deficient number, since it is larger than the sum of its proper divisors (1).

25643263 is an equidigital number, since it uses as much as digits as its factorization.

25643263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 31.

The square root of 25643263 is about 5063.9177520967. The cubic root of 25643263 is about 294.8884496367. Note that the first 3 decimals are identical.

The spelling of 25643263 in words is "twenty-five million, six hundred forty-three thousand, two hundred sixty-three".