25681603 has 2 divisors, whose sum is σ = 25681604. Its totient is φ = 25681602.

The previous prime is 25681583. The next prime is 25681613. The reversal of 25681603 is 30618652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25681603 - 2⁵ = 25681571 is a prime.

It is not a weakly prime, because it can be changed into another prime (25681613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12840801 + 12840802.

It is an arithmetic number, because the mean of its divisors is an integer number (12840802).

Almost surely, 2^25681603 is an apocalyptic number.

25681603 is a deficient number, since it is larger than the sum of its proper divisors (1).

25681603 is an equidigital number, since it uses as much as digits as its factorization.

25681603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 25681603 is about 5067.7019446688. The cubic root of 25681603 is about 295.0353419307.

The spelling of 25681603 in words is "twenty-five million, six hundred eighty-one thousand, six hundred three".