25644655 has 16 divisors (see below), whose sum is σ = 32322240. Its totient is φ = 19495168.

The previous prime is 25644649. The next prime is 25644659. The reversal of 25644655 is 55644652.

It is not a de Polignac number, because 25644655 - 2¹¹ = 25642607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25644659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19251 + ... + 20539.

It is an arithmetic number, because the mean of its divisors is an integer number (2020140).

Almost surely, 2^25644655 is an apocalyptic number.

25644655 is a deficient number, since it is larger than the sum of its proper divisors (6677585).

25644655 is a wasteful number, since it uses less digits than its factorization.

25644655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490.

The product of its digits is 144000, while the sum is 37.

The square root of 25644655 is about 5064.0551932221. The cubic root of 25644655 is about 294.8937853760.

It can be divided in two parts, 25 and 644655, that added together give a triangular number (644680 = T₁₁₃₅).

The spelling of 25644655 in words is "twenty-five million, six hundred forty-four thousand, six hundred fifty-five".