25105565 has 8 divisors (see below), whose sum is σ = 30465720. Its totient is φ = 19858432.

The previous prime is 25105547. The next prime is 25105579. The reversal of 25105565 is 56550152.

It can be written as a sum of positive squares in 4 ways, for example, as 1085764 + 24019801 = 1042^2 + 4901^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25105565 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27764 + ... + 28653.

It is an arithmetic number, because the mean of its divisors is an integer number (3808215).

Almost surely, 2^25105565 is an apocalyptic number.

It is an amenable number.

25105565 is a deficient number, since it is larger than the sum of its proper divisors (5360155).

25105565 is an equidigital number, since it uses as much as digits as its factorization.

25105565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56511.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 25105565 is about 5010.5453794971. The cubic root of 25105565 is about 292.8127611280.

The spelling of 25105565 in words is "twenty-five million, one hundred five thousand, five hundred sixty-five".