25979661 has 12 divisors (see below), whose sum is σ = 38540892. Its totient is φ = 16851456.

The previous prime is 25979659. The next prime is 25979671. The reversal of 25979661 is 16697952.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8964036 + 17015625 = 2994^2 + 4125^2 .

It is not a de Polignac number, because 25979661 - 2¹ = 25979659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25979651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38676 + ... + 39341.

It is an arithmetic number, because the mean of its divisors is an integer number (3211741).

Almost surely, 2^25979661 is an apocalyptic number.

It is an amenable number.

25979661 is a deficient number, since it is larger than the sum of its proper divisors (12561231).

25979661 is a wasteful number, since it uses less digits than its factorization.

25979661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78060 (or 78057 counting only the distinct ones).

The product of its digits is 204120, while the sum is 45.

The square root of 25979661 is about 5097.0247203638. The cubic root of 25979661 is about 296.1723377048.

The spelling of 25979661 in words is "twenty-five million, nine hundred seventy-nine thousand, six hundred sixty-one".