2505605653 has 4 divisors (see below), whose sum is σ = 2566718028. Its totient is φ = 2444493280.

The previous prime is 2505605651. The next prime is 2505605689. The reversal of 2505605653 is 3565065052.

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 84768849 + 2420836804 = 9207^2 + 49202^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505605653 - 2¹ = 2505605651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505605651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30556126 + ... + 30556207.

It is an arithmetic number, because the mean of its divisors is an integer number (641679507).

Almost surely, 2^2505605653 is an apocalyptic number.

It is an amenable number.

2505605653 is a deficient number, since it is larger than the sum of its proper divisors (61112375).

2505605653 is an equidigital number, since it uses as much as digits as its factorization.

2505605653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61112374.

The product of its (nonzero) digits is 135000, while the sum is 37.

The square root of 2505605653 is about 50056.0251418348. The cubic root of 2505605653 is about 1358.2224566035. Note that the first 3 decimals are identical.

The spelling of 2505605653 in words is "two billion, five hundred five million, six hundred five thousand, six hundred fifty-three".