2565563353 has 4 divisors (see below), whose sum is σ = 2566044468. Its totient is φ = 2565082240.

The previous prime is 2565563321. The next prime is 2565563389. The reversal of 2565563353 is 3533655652.

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 1767613849 + 797949504 = 42043^2 + 28248^2 .

It is a cyclic number.

It is not a de Polignac number, because 2565563353 - 2⁵ = 2565563321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2565563053) 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, 232468 + ... + 243253.

It is an arithmetic number, because the mean of its divisors is an integer number (641511117).

Almost surely, 2^2565563353 is an apocalyptic number.

It is an amenable number.

2565563353 is a deficient number, since it is larger than the sum of its proper divisors (481115).

2565563353 is an equidigital number, since it uses as much as digits as its factorization.

2565563353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481114.

The product of its digits is 1215000, while the sum is 43.

The square root of 2565563353 is about 50651.3904350118. The cubic root of 2565563353 is about 1368.9709986754.

The spelling of 2565563353 in words is "two billion, five hundred sixty-five million, five hundred sixty-three thousand, three hundred fifty-three".