25106661 has 6 divisors (see below), whose sum is σ = 36265190. Its totient is φ = 16737768.

The previous prime is 25106647. The next prime is 25106689. The reversal of 25106661 is 16660152.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 25100100 + 6561 = 5010^2 + 81^2 .

It is not a de Polignac number, because 25106661 - 2⁵ = 25106629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25106611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1394806 + ... + 1394823.

Almost surely, 2^25106661 is an apocalyptic number.

It is an amenable number.

25106661 is a deficient number, since it is larger than the sum of its proper divisors (11158529).

25106661 is a wasteful number, since it uses less digits than its factorization.

25106661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2789635 (or 2789632 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 25106661 is about 5010.6547476353. The cubic root of 25106661 is about 292.8170220441.

The spelling of 25106661 in words is "twenty-five million, one hundred six thousand, six hundred sixty-one".