25926561 has 10 divisors (see below), whose sum is σ = 38729922. Its totient is φ = 17284320.

The previous prime is 25926559. The next prime is 25926577. The reversal of 25926561 is 16562952.

25926561 is a `hidden beast` number, since 2 + 5 + 92 + 6 + 561 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23184225 + 2742336 = 4815^2 + 1656^2 .

It is not a de Polignac number, because 25926561 - 2¹ = 25926559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25926541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 159960 + ... + 160121.

Almost surely, 2^25926561 is an apocalyptic number.

It is an amenable number.

25926561 is a deficient number, since it is larger than the sum of its proper divisors (12803361).

25926561 is an equidigital number, since it uses as much as digits as its factorization.

25926561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320093 (or 320084 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 25926561 is about 5091.8131348273. The cubic root of 25926561 is about 295.9704172103.

The spelling of 25926561 in words is "twenty-five million, nine hundred twenty-six thousand, five hundred sixty-one".