25659649 has 2 divisors, whose sum is σ = 25659650. Its totient is φ = 25659648.

The previous prime is 25659643. The next prime is 25659659. The reversal of 25659649 is 94695652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15547249 + 10112400 = 3943^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 25659649 - 2⁷ = 25659521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25659599 and 25659608.

It is not a weakly prime, because it can be changed into another prime (25659643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12829824 + 12829825.

It is an arithmetic number, because the mean of its divisors is an integer number (12829825).

Almost surely, 2^25659649 is an apocalyptic number.

It is an amenable number.

25659649 is a deficient number, since it is larger than the sum of its proper divisors (1).

25659649 is an equidigital number, since it uses as much as digits as its factorization.

25659649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 46.

The square root of 25659649 is about 5065.5354109906. The cubic root of 25659649 is about 294.9512473298.

The spelling of 25659649 in words is "twenty-five million, six hundred fifty-nine thousand, six hundred forty-nine".