25665779 has 2 divisors, whose sum is σ = 25665780. Its totient is φ = 25665778.

The previous prime is 25665763. The next prime is 25665793. The reversal of 25665779 is 97756652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25665779 - 2⁴ = 25665763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25665749) 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, 12832889 + 12832890.

It is an arithmetic number, because the mean of its divisors is an integer number (12832890).

Almost surely, 2^25665779 is an apocalyptic number.

25665779 is a deficient number, since it is larger than the sum of its proper divisors (1).

25665779 is an equidigital number, since it uses as much as digits as its factorization.

25665779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 793800, while the sum is 47.

The square root of 25665779 is about 5066.1404441646. The cubic root of 25665779 is about 294.9747330653.

The spelling of 25665779 in words is "twenty-five million, six hundred sixty-five thousand, seven hundred seventy-nine".