25666065 has 40 divisors (see below), whose sum is σ = 46464000. Its totient is φ = 13553568.

The previous prime is 25666057. The next prime is 25666099. The reversal of 25666065 is 56066652.

It is not a de Polignac number, because 25666065 - 2³ = 25666057 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 51186 + ... + 51684.

It is an arithmetic number, because the mean of its divisors is an integer number (1161600).

Almost surely, 2^25666065 is an apocalyptic number.

It is an amenable number.

25666065 is a deficient number, since it is larger than the sum of its proper divisors (20797935).

25666065 is a wasteful number, since it uses less digits than its factorization.

25666065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 25666065 is about 5066.1686707018. The cubic root of 25666065 is about 294.9758287195.

The spelling of 25666065 in words is "twenty-five million, six hundred sixty-six thousand, sixty-five".