25765517 has 2 divisors, whose sum is σ = 25765518. Its totient is φ = 25765516.

The previous prime is 25765511. The next prime is 25765547. The reversal of 25765517 is 71556752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25694761 + 70756 = 5069^2 + 266^2 .

It is a cyclic number.

It is not a de Polignac number, because 25765517 - 2¹⁰ = 25764493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25765511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12882758 + 12882759.

It is an arithmetic number, because the mean of its divisors is an integer number (12882759).

Almost surely, 2^25765517 is an apocalyptic number.

It is an amenable number.

25765517 is a deficient number, since it is larger than the sum of its proper divisors (1).

25765517 is an equidigital number, since it uses as much as digits as its factorization.

25765517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 73500, while the sum is 38.

The square root of 25765517 is about 5075.9744877215. The cubic root of 25765517 is about 295.3563327917.

The spelling of 25765517 in words is "twenty-five million, seven hundred sixty-five thousand, five hundred seventeen".