2561389798 has 16 divisors (see below), whose sum is σ = 4204598544. Its totient is φ = 1160592160.

The previous prime is 2561389793. The next prime is 2561389799. The reversal of 2561389798 is 8979831652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561389793) 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, 176665 + ... + 190612.

It is an arithmetic number, because the mean of its divisors is an integer number (262787409).

Almost surely, 2^2561389798 is an apocalyptic number.

2561389798 is a deficient number, since it is larger than the sum of its proper divisors (1643208746).

2561389798 is a wasteful number, since it uses less digits than its factorization.

2561389798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367607.

The product of its digits is 6531840, while the sum is 58.

The square root of 2561389798 is about 50610.1748465662. The cubic root of 2561389798 is about 1368.2282668432.

The spelling of 2561389798 in words is "two billion, five hundred sixty-one million, three hundred eighty-nine thousand, seven hundred ninety-eight".