25666331 has 2 divisors, whose sum is σ = 25666332. Its totient is φ = 25666330.

The previous prime is 25666327. The next prime is 25666337. The reversal of 25666331 is 13366652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25666331 - 2² = 25666327 is a prime.

It is a super-2 number, since 2×25666331² = 1317521094003122, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (25666337) 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, 12833165 + 12833166.

It is an arithmetic number, because the mean of its divisors is an integer number (12833166).

Almost surely, 2^25666331 is an apocalyptic number.

25666331 is a deficient number, since it is larger than the sum of its proper divisors (1).

25666331 is an equidigital number, since it uses as much as digits as its factorization.

25666331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 32.

The square root of 25666331 is about 5066.1949232141. The cubic root of 25666331 is about 294.9768477473.

The spelling of 25666331 in words is "twenty-five million, six hundred sixty-six thousand, three hundred thirty-one".