25663005 has 24 divisors (see below), whose sum is σ = 45216600. Its totient is φ = 13461120.

The previous prime is 25663003. The next prime is 25663037. The reversal of 25663005 is 50036652.

25663005 is a `hidden beast` number, since 25 + 6 + 630 + 0 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1279161 + 24383844 = 1131^2 + 4938^2 .

It is not a de Polignac number, because 25663005 - 2¹ = 25663003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25663005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25663003) 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 23 ways as a sum of consecutive naturals, for example, 1930 + ... + 7419.

It is an arithmetic number, because the mean of its divisors is an integer number (1884025).

Almost surely, 2^25663005 is an apocalyptic number.

It is an amenable number.

25663005 is a deficient number, since it is larger than the sum of its proper divisors (19553595).

25663005 is a wasteful number, since it uses less digits than its factorization.

25663005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9421 (or 9418 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 25663005 is about 5065.8666583320. The cubic root of 25663005 is about 294.9641055628.

Adding to 25663005 its reverse (50036652), we get a palindrome (75699657).

The spelling of 25663005 in words is "twenty-five million, six hundred sixty-three thousand, five".