25799565 has 16 divisors (see below), whose sum is σ = 45032256. Its totient is φ = 12508800.

The previous prime is 25799563. The next prime is 25799567. The reversal of 25799565 is 56599752.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25799563) and next prime (25799567).

It is not a de Polignac number, because 25799565 - 2¹ = 25799563 is a prime.

It is a super-3 number, since 3×25799565³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25799561) 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 15 ways as a sum of consecutive naturals, for example, 78016 + ... + 78345.

It is an arithmetic number, because the mean of its divisors is an integer number (2814516).

Almost surely, 2^25799565 is an apocalyptic number.

It is an amenable number.

25799565 is a deficient number, since it is larger than the sum of its proper divisors (19232691).

25799565 is a wasteful number, since it uses less digits than its factorization.

25799565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156380.

The product of its digits is 850500, while the sum is 48.

The square root of 25799565 is about 5079.3272192289. The cubic root of 25799565 is about 295.4863756706.

The spelling of 25799565 in words is "twenty-five million, seven hundred ninety-nine thousand, five hundred sixty-five".