25166661 has 16 divisors (see below), whose sum is σ = 37020480. Its totient is φ = 15108480.

The previous prime is 25166651. The next prime is 25166707. The reversal of 25166661 is 16666152.

It is not a de Polignac number, because 25166661 - 2⁶ = 25166597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25166651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6271 + ... + 9468.

It is an arithmetic number, because the mean of its divisors is an integer number (2313780).

Almost surely, 2^25166661 is an apocalyptic number.

It is an amenable number.

25166661 is a deficient number, since it is larger than the sum of its proper divisors (11853819).

25166661 is a wasteful number, since it uses less digits than its factorization.

25166661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15796.

The product of its digits is 12960, while the sum is 33.

The square root of 25166661 is about 5016.6384163103. The cubic root of 25166661 is about 293.0500949109.

The spelling of 25166661 in words is "twenty-five million, one hundred sixty-six thousand, six hundred sixty-one".