25665071 has 2 divisors, whose sum is σ = 25665072. Its totient is φ = 25665070.

The previous prime is 25665047. The next prime is 25665077. The reversal of 25665071 is 17056652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25665071 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25665077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832535 + 12832536.

It is an arithmetic number, because the mean of its divisors is an integer number (12832536).

Almost surely, 2^25665071 is an apocalyptic number.

25665071 is a deficient number, since it is larger than the sum of its proper divisors (1).

25665071 is an equidigital number, since it uses as much as digits as its factorization.

25665071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 25665071 is about 5066.0705680044. The cubic root of 25665071 is about 294.9720207113.

The spelling of 25665071 in words is "twenty-five million, six hundred sixty-five thousand, seventy-one".