2581806530 has 16 divisors (see below), whose sum is σ = 4648057344. Its totient is φ = 1032543600.

The previous prime is 2581806509. The next prime is 2581806533. The reversal of 2581806530 is 356081852.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2581806533) 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 7 ways as a sum of consecutive naturals, for example, 49055 + ... + 87005.

It is an arithmetic number, because the mean of its divisors is an integer number (290503584).

Almost surely, 2^2581806530 is an apocalyptic number.

2581806530 is a deficient number, since it is larger than the sum of its proper divisors (2066250814).

2581806530 is a wasteful number, since it uses less digits than its factorization.

2581806530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44761.

The product of its (nonzero) digits is 57600, while the sum is 38.

The square root of 2581806530 is about 50811.4802972714. The cubic root of 2581806530 is about 1371.8540138964.

The spelling of 2581806530 in words is "two billion, five hundred eighty-one million, eight hundred six thousand, five hundred thirty".