25776561 has 8 divisors (see below), whose sum is σ = 34396384. Its totient is φ = 17170560.

The previous prime is 25776547. The next prime is 25776571. The reversal of 25776561 is 16567752.

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

It is not a de Polignac number, because 25776561 - 2⁵ = 25776529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25776571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2241 + ... + 7521.

It is an arithmetic number, because the mean of its divisors is an integer number (4299548).

Almost surely, 2^25776561 is an apocalyptic number.

It is an amenable number.

25776561 is a deficient number, since it is larger than the sum of its proper divisors (8619823).

25776561 is a wasteful number, since it uses less digits than its factorization.

25776561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6911.

The product of its digits is 88200, while the sum is 39.

The square root of 25776561 is about 5077.0622410997. The cubic root of 25776561 is about 295.3985267752.

The spelling of 25776561 in words is "twenty-five million, seven hundred seventy-six thousand, five hundred sixty-one".