25665081 has 8 divisors (see below), whose sum is σ = 36852480. Its totient is φ = 15793872.

The previous prime is 25665077. The next prime is 25665089. The reversal of 25665081 is 18056652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25665081 - 2² = 25665077 is a prime.

It is a super-2 number, since 2×25665081² = 1317392765473122, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25665089) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329001 + ... + 329078.

It is an arithmetic number, because the mean of its divisors is an integer number (4606560).

Almost surely, 2^25665081 is an apocalyptic number.

It is an amenable number.

25665081 is a deficient number, since it is larger than the sum of its proper divisors (11187399).

25665081 is a wasteful number, since it uses less digits than its factorization.

25665081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658095.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 25665081 is about 5066.0715549625. The cubic root of 25665081 is about 294.9720590218.

The spelling of 25665081 in words is "twenty-five million, six hundred sixty-five thousand, eighty-one".