2561865048912 has 40 divisors (see below), whose sum is σ = 7127239945504. Its totient is φ = 788266168704.

The previous prime is 2561865048793. The next prime is 2561865048931. The reversal of 2561865048912 is 2198405681652.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2052775858 + ... + 2052777105.

Almost surely, 2^{2561865048912} is an apocalyptic number.

It is an amenable number.

2561865048912 is an abundant number, since it is smaller than the sum of its proper divisors (4565374896592).

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

2561865048912 is a wasteful number, since it uses less digits than its factorization.

2561865048912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105552987 (or 4105552981 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 57.

The spelling of 2561865048912 in words is "two trillion, five hundred sixty-one billion, eight hundred sixty-five million, forty-eight thousand, nine hundred twelve".