2565500644 has 36 divisors (see below), whose sum is σ = 5231670444. Its totient is φ = 1097596416.

The previous prime is 2565500611. The next prime is 2565500647. The reversal of 2565500644 is 4460055652.

It can be written as a sum of positive squares in 2 ways, for example, as 2134440000 + 431060644 = 46200^2 + 20762^2 .

It is not an unprimeable number, because it can be changed into a prime (2565500647) 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 11 ways as a sum of consecutive naturals, for example, 105192 + ... + 127264.

It is an arithmetic number, because the mean of its divisors is an integer number (145324179).

Almost surely, 2^2565500644 is an apocalyptic number.

It is an amenable number.

2565500644 is an abundant number, since it is smaller than the sum of its proper divisors (2666169800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2565500644 is a wasteful number, since it uses less digits than its factorization.

2565500644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22684 (or 22675 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The square root of 2565500644 is about 50650.7714057743. The cubic root of 2565500644 is about 1368.9598448546.

The spelling of 2565500644 in words is "two billion, five hundred sixty-five million, five hundred thousand, six hundred forty-four".