25646861 has 2 divisors, whose sum is σ = 25646862. Its totient is φ = 25646860.

The previous prime is 25646857. The next prime is 25646867. The reversal of 25646861 is 16864652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22857961 + 2788900 = 4781^2 + 1670^2 .

It is a cyclic number.

It is not a de Polignac number, because 25646861 - 2² = 25646857 is a prime.

It is a super-2 number, since 2×25646861² = 1315522958306642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25646867) 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, 12823430 + 12823431.

It is an arithmetic number, because the mean of its divisors is an integer number (12823431).

Almost surely, 2^25646861 is an apocalyptic number.

It is an amenable number.

25646861 is a deficient number, since it is larger than the sum of its proper divisors (1).

25646861 is an equidigital number, since it uses as much as digits as its factorization.

25646861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 38.

The square root of 25646861 is about 5064.2729981706. The cubic root of 25646861 is about 294.9022409006.

The spelling of 25646861 in words is "twenty-five million, six hundred forty-six thousand, eight hundred sixty-one".