2561989796 has 24 divisors (see below), whose sum is σ = 4629037056. Its totient is φ = 1239900480.

The previous prime is 2561989789. The next prime is 2561989831. The reversal of 2561989796 is 6979891652.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40676 + ... + 82331.

It is an arithmetic number, because the mean of its divisors is an integer number (192876544).

Almost surely, 2^2561989796 is an apocalyptic number.

It is an amenable number.

2561989796 is a deficient number, since it is larger than the sum of its proper divisors (2067047260).

2561989796 is a wasteful number, since it uses less digits than its factorization.

2561989796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123179 (or 123177 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 62.

The square root of 2561989796 is about 50616.1021415122. The cubic root of 2561989796 is about 1368.3350929800.

The spelling of 2561989796 in words is "two billion, five hundred sixty-one million, nine hundred eighty-nine thousand, seven hundred ninety-six".