25565503 has 2 divisors, whose sum is σ = 25565504. Its totient is φ = 25565502.

The previous prime is 25565479. The next prime is 25565513. The reversal of 25565503 is 30556552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25565503 - 2²¹ = 23468351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25565513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12782751 + 12782752.

It is an arithmetic number, because the mean of its divisors is an integer number (12782752).

Almost surely, 2^25565503 is an apocalyptic number.

25565503 is a deficient number, since it is larger than the sum of its proper divisors (1).

25565503 is an equidigital number, since it uses as much as digits as its factorization.

25565503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 31.

The square root of 25565503 is about 5056.2340729045. The cubic root of 25565503 is about 294.5900770134.

The spelling of 25565503 in words is "twenty-five million, five hundred sixty-five thousand, five hundred three".