25666679 has 2 divisors, whose sum is σ = 25666680. Its totient is φ = 25666678.

The previous prime is 25666661. The next prime is 25666687. The reversal of 25666679 is 97666652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 25666679 - 2¹² = 25662583 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25666639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12833339 + 12833340.

It is an arithmetic number, because the mean of its divisors is an integer number (12833340).

Almost surely, 2^25666679 is an apocalyptic number.

25666679 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666679 is an equidigital number, since it uses as much as digits as its factorization.

25666679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 47.

The square root of 25666679 is about 5066.2292684007. The cubic root of 25666679 is about 294.9781809008.

The spelling of 25666679 in words is "twenty-five million, six hundred sixty-six thousand, six hundred seventy-nine".