25665331 has 2 divisors, whose sum is σ = 25665332. Its totient is φ = 25665330.

The previous prime is 25665329. The next prime is 25665347. The reversal of 25665331 is 13356652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 25665331 - 2¹ = 25665329 is a prime.

It is a super-3 number, since 3×25665331³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 25665329, it forms a pair of twin primes.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 25665293 and 25665302.

It is not a weakly prime, because it can be changed into another prime (25665361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12832665 + 12832666.

It is an arithmetic number, because the mean of its divisors is an integer number (12832666).

Almost surely, 2^25665331 is an apocalyptic number.

25665331 is a deficient number, since it is larger than the sum of its proper divisors (1).

25665331 is an equidigital number, since it uses as much as digits as its factorization.

25665331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16200, while the sum is 31.

The square root of 25665331 is about 5066.0962288531. The cubic root of 25665331 is about 294.9730167793.

The spelling of 25665331 in words is "twenty-five million, six hundred sixty-five thousand, three hundred thirty-one".