25561653 has 16 divisors (see below), whose sum is σ = 36812160. Its totient is φ = 15683904.

The previous prime is 25561649. The next prime is 25561661. The reversal of 25561653 is 35616552.

It is not a de Polignac number, because 25561653 - 2² = 25561649 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25561603) 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, 16375 + ... + 17867.

It is an arithmetic number, because the mean of its divisors is an integer number (2300760).

Almost surely, 2^25561653 is an apocalyptic number.

It is an amenable number.

25561653 is a deficient number, since it is larger than the sum of its proper divisors (11250507).

25561653 is a wasteful number, since it uses less digits than its factorization.

25561653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948.

The product of its digits is 27000, while the sum is 33.

The square root of 25561653 is about 5055.8533404362. The cubic root of 25561653 is about 294.5752884819.

It can be divided in two parts, 2 and 5561653, that added together give a palindrome (5561655).

The spelling of 25561653 in words is "twenty-five million, five hundred sixty-one thousand, six hundred fifty-three".