2566500560 has 80 divisors (see below), whose sum is σ = 6599900496. Its totient is φ = 922005504.

The previous prime is 2566500539. The next prime is 2566500569. The reversal of 2566500560 is 650056652.

It can be written as a sum of positive squares in 8 ways, for example, as 381499024 + 2185001536 = 19532^2 + 46744^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 2566500560.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566500569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5132 + ... + 71828.

Almost surely, 2^2566500560 is an apocalyptic number.

2566500560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2566500560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3299950248).

2566500560 is an abundant number, since it is smaller than the sum of its proper divisors (4033399936).

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

2566500560 is a wasteful number, since it uses less digits than its factorization.

2566500560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66760 (or 66754 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 2566500560 is about 50660.6411329347. The cubic root of 2566500560 is about 1369.1376746096.

The spelling of 2566500560 in words is "two billion, five hundred sixty-six million, five hundred thousand, five hundred sixty".