25665349 has 4 divisors (see below), whose sum is σ = 25707564. Its totient is φ = 25623136.

The previous prime is 25665347. The next prime is 25665361. The reversal of 25665349 is 94356652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3744225 + 21921124 = 1935^2 + 4682^2 .

It is a cyclic number.

It is not a de Polignac number, because 25665349 - 2¹ = 25665347 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20182 + ... + 21415.

It is an arithmetic number, because the mean of its divisors is an integer number (6426891).

Almost surely, 2^25665349 is an apocalyptic number.

It is an amenable number.

25665349 is a deficient number, since it is larger than the sum of its proper divisors (42215).

25665349 is an equidigital number, since it uses as much as digits as its factorization.

25665349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42214.

The product of its digits is 194400, while the sum is 40.

The square root of 25665349 is about 5066.0980053686. The cubic root of 25665349 is about 294.9730857376.

The spelling of 25665349 in words is "twenty-five million, six hundred sixty-five thousand, three hundred forty-nine".