2561175240 has 128 divisors (see below), whose sum is σ = 8305839360. Its totient is φ = 628061184.

The previous prime is 2561175157. The next prime is 2561175247. The reversal of 2561175240 is 425711652.

It is not an unprimeable number, because it can be changed into a prime (2561175247) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 429157 + ... + 435083.

It is an arithmetic number, because the mean of its divisors is an integer number (64889370).

Almost surely, 2^2561175240 is an apocalyptic number.

2561175240 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 2561175240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4152919680).

2561175240 is an abundant number, since it is smaller than the sum of its proper divisors (5744664120).

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

2561175240 is a wasteful number, since it uses less digits than its factorization.

2561175240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6231 (or 6227 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 2561175240 is about 50608.0550900743. The cubic root of 2561175240 is about 1368.1900619959.

Adding to 2561175240 its reverse (425711652), we get a palindrome (2986886892).

The spelling of 2561175240 in words is "two billion, five hundred sixty-one million, one hundred seventy-five thousand, two hundred forty".