25666687 has 2 divisors, whose sum is σ = 25666688. Its totient is φ = 25666686.

The previous prime is 25666679. The next prime is 25666703. The reversal of 25666687 is 78666652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25666687 - 2³ = 25666679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833343 + 12833344.

It is an arithmetic number, because the mean of its divisors is an integer number (12833344).

Almost surely, 2^25666687 is an apocalyptic number.

25666687 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666687 is an equidigital number, since it uses as much as digits as its factorization.

25666687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 46.

The square root of 25666687 is about 5066.2300579425. The cubic root of 25666687 is about 294.9782115479.

The spelling of 25666687 in words is "twenty-five million, six hundred sixty-six thousand, six hundred eighty-seven".