25865641 has 2 divisors, whose sum is σ = 25865642. Its totient is φ = 25865640.

The previous prime is 25865633. The next prime is 25865657. The reversal of 25865641 is 14656852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19105641 + 6760000 = 4371^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 25865641 - 2³ = 25865633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25865641.

It is not a weakly prime, because it can be changed into another prime (25865611) 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, 12932820 + 12932821.

It is an arithmetic number, because the mean of its divisors is an integer number (12932821).

Almost surely, 2^25865641 is an apocalyptic number.

It is an amenable number.

25865641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25865641 is an equidigital number, since it uses as much as digits as its factorization.

25865641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 37.

The square root of 25865641 is about 5085.8274646315. The cubic root of 25865641 is about 295.7384201416.

The spelling of 25865641 in words is "twenty-five million, eight hundred sixty-five thousand, six hundred forty-one".