25660513 has 2 divisors, whose sum is σ = 25660514. Its totient is φ = 25660512.

The previous prime is 25660501. The next prime is 25660519. The reversal of 25660513 is 31506652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22591009 + 3069504 = 4753^2 + 1752^2 .

It is a cyclic number.

It is not a de Polignac number, because 25660513 - 2⁹ = 25660001 is a prime.

It is not a weakly prime, because it can be changed into another prime (25660519) 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, 12830256 + 12830257.

It is an arithmetic number, because the mean of its divisors is an integer number (12830257).

Almost surely, 2^25660513 is an apocalyptic number.

It is an amenable number.

25660513 is a deficient number, since it is larger than the sum of its proper divisors (1).

25660513 is an equidigital number, since it uses as much as digits as its factorization.

25660513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 25660513 is about 5065.6206924720. The cubic root of 25660513 is about 294.9545577806.

The spelling of 25660513 in words is "twenty-five million, six hundred sixty thousand, five hundred thirteen".