25585561 has 4 divisors (see below), whose sum is σ = 27090612. Its totient is φ = 24080512.

The previous prime is 25585543. The next prime is 25585577. The reversal of 25585561 is 16558552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11289600 + 14295961 = 3360^2 + 3781^2 .

It is a cyclic number.

It is not a de Polignac number, because 25585561 - 2¹³ = 25577369 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25585561.

It is not an unprimeable number, because it can be changed into a prime (25585661) 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 3 ways as a sum of consecutive naturals, for example, 752500 + ... + 752533.

It is an arithmetic number, because the mean of its divisors is an integer number (6772653).

Almost surely, 2^25585561 is an apocalyptic number.

It is an amenable number.

25585561 is a deficient number, since it is larger than the sum of its proper divisors (1505051).

25585561 is a wasteful number, since it uses less digits than its factorization.

25585561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505050.

The product of its digits is 60000, while the sum is 37.

The square root of 25585561 is about 5058.2171760414. The cubic root of 25585561 is about 294.6670993342.

The spelling of 25585561 in words is "twenty-five million, five hundred eighty-five thousand, five hundred sixty-one".