2565235563 has 64 divisors (see below), whose sum is σ = 4061933568. Its totient is φ = 1424142720.

The previous prime is 2565235559. The next prime is 2565235579. The reversal of 2565235563 is 3655325652.

It is not a de Polignac number, because 2565235563 - 2² = 2565235559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2565235363) 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 63 ways as a sum of consecutive naturals, for example, 1729020 + ... + 1730502.

It is an arithmetic number, because the mean of its divisors is an integer number (63467712).

Almost surely, 2^2565235563 is an apocalyptic number.

2565235563 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2565235563 is a deficient number, since it is larger than the sum of its proper divisors (1496698005).

2565235563 is a wasteful number, since it uses less digits than its factorization.

2565235563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616.

The product of its digits is 810000, while the sum is 42.

The square root of 2565235563 is about 50648.1545863223. The cubic root of 2565235563 is about 1368.9126938571.

The spelling of 2565235563 in words is "two billion, five hundred sixty-five million, two hundred thirty-five thousand, five hundred sixty-three".