2561233886 has 24 divisors (see below), whose sum is σ = 3935684376. Its totient is φ = 1250068400.

The previous prime is 2561233853. The next prime is 2561233903. The reversal of 2561233886 is 6883321652.

It is a congruent number.

It is an unprimeable number.

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, 3096605 + ... + 3097431.

It is an arithmetic number, because the mean of its divisors is an integer number (163986849).

Almost surely, 2^2561233886 is an apocalyptic number.

2561233886 is a deficient number, since it is larger than the sum of its proper divisors (1374450490).

2561233886 is an equidigital number, since it uses as much as digits as its factorization.

2561233886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624 (or 1577 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 2561233886 is about 50608.6345004486. The cubic root of 2561233886 is about 1368.2005048922.

The spelling of 2561233886 in words is "two billion, five hundred sixty-one million, two hundred thirty-three thousand, eight hundred eighty-six".