25566251 has 2 divisors, whose sum is σ = 25566252. Its totient is φ = 25566250.

The previous prime is 25566199. The next prime is 25566287. The reversal of 25566251 is 15266552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25566251 - 2⁶ = 25566187 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25566451) 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, 12783125 + 12783126.

It is an arithmetic number, because the mean of its divisors is an integer number (12783126).

Almost surely, 2^25566251 is an apocalyptic number.

25566251 is a deficient number, since it is larger than the sum of its proper divisors (1).

25566251 is an equidigital number, since it uses as much as digits as its factorization.

25566251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18000, while the sum is 32.

The square root of 25566251 is about 5056.3080404580. The cubic root of 25566251 is about 294.5929500415.

The spelling of 25566251 in words is "twenty-five million, five hundred sixty-six thousand, two hundred fifty-one".