25560817 has 2 divisors, whose sum is σ = 25560818. Its totient is φ = 25560816.

The previous prime is 25560793. The next prime is 25560823. The reversal of 25560817 is 71806552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13512976 + 12047841 = 3676^2 + 3471^2 .

It is a cyclic number.

It is not a de Polignac number, because 25560817 - 2¹⁵ = 25528049 is a prime.

It is not a weakly prime, because it can be changed into another prime (25560217) 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, 12780408 + 12780409.

It is an arithmetic number, because the mean of its divisors is an integer number (12780409).

Almost surely, 2^25560817 is an apocalyptic number.

It is an amenable number.

25560817 is a deficient number, since it is larger than the sum of its proper divisors (1).

25560817 is an equidigital number, since it uses as much as digits as its factorization.

25560817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 25560817 is about 5055.7706633114. The cubic root of 25560817 is about 294.5720770617.

The spelling of 25560817 in words is "twenty-five million, five hundred sixty thousand, eight hundred seventeen".