25651603 has 2 divisors, whose sum is σ = 25651604. Its totient is φ = 25651602.

The previous prime is 25651597. The next prime is 25651651. The reversal of 25651603 is 30615652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25651603 is a prime.

It is not a weakly prime, because it can be changed into another prime (25651673) 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, 12825801 + 12825802.

It is an arithmetic number, because the mean of its divisors is an integer number (12825802).

Almost surely, 2^25651603 is an apocalyptic number.

25651603 is a deficient number, since it is larger than the sum of its proper divisors (1).

25651603 is an equidigital number, since it uses as much as digits as its factorization.

25651603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 25651603 is about 5064.7411582429. The cubic root of 25651603 is about 294.9204151878.

The spelling of 25651603 in words is "twenty-five million, six hundred fifty-one thousand, six hundred three".