2565225653 has 4 divisors (see below), whose sum is σ = 2653681740. Its totient is φ = 2476769568.

The previous prime is 2565225647. The next prime is 2565225661. The reversal of 2565225653 is 3565225652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1479325444 + 1085900209 = 38462^2 + 32953^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565225653 - 2¹² = 2565221557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2565225653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2565225623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44228000 + ... + 44228057.

It is an arithmetic number, because the mean of its divisors is an integer number (663420435).

Almost surely, 2^2565225653 is an apocalyptic number.

It is an amenable number.

2565225653 is a deficient number, since it is larger than the sum of its proper divisors (88456087).

2565225653 is an equidigital number, since it uses as much as digits as its factorization.

2565225653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88456086.

The product of its digits is 540000, while the sum is 41.

The square root of 2565225653 is about 50648.0567544304. The cubic root of 2565225653 is about 1368.9109310635.

Subtracting 2565225653 from its reverse (3565225652), we obtain a palindrome (999999999).

The spelling of 2565225653 in words is "two billion, five hundred sixty-five million, two hundred twenty-five thousand, six hundred fifty-three".