25696561 has 8 divisors (see below), whose sum is σ = 28322784. Its totient is φ = 23118720.

The previous prime is 25696549. The next prime is 25696597. The reversal of 25696561 is 16569652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25696561 - 2⁹ = 25696049 is a prime.

It is a super-3 number, since 3×25696561³ (a number of 23 digits) contains 333 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25696261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10975 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (3540348).

Almost surely, 2^25696561 is an apocalyptic number.

It is an amenable number.

25696561 is a deficient number, since it is larger than the sum of its proper divisors (2626223).

25696561 is a wasteful number, since it uses less digits than its factorization.

25696561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24191.

The product of its digits is 97200, while the sum is 40.

The square root of 25696561 is about 5069.1775467032. The cubic root of 25696561 is about 295.0926109691.

The spelling of 25696561 in words is "twenty-five million, six hundred ninety-six thousand, five hundred sixty-one".