25563906503 has 2 divisors, whose sum is σ = 25563906504. Its totient is φ = 25563906502.

The previous prime is 25563906499. The next prime is 25563906547. The reversal of 25563906503 is 30560936552.

It is an a-pointer prime, because the next prime (25563906547) can be obtained adding 25563906503 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25563906503 - 2² = 25563906499 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25563902503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12781953251 + 12781953252.

It is an arithmetic number, because the mean of its divisors is an integer number (12781953252).

Almost surely, 2^25563906503 is an apocalyptic number.

25563906503 is a deficient number, since it is larger than the sum of its proper divisors (1).

25563906503 is an equidigital number, since it uses as much as digits as its factorization.

25563906503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729000, while the sum is 44.

The spelling of 25563906503 in words is "twenty-five billion, five hundred sixty-three million, nine hundred six thousand, five hundred three".