2561358011650 has 48 divisors (see below), whose sum is σ = 4832516313000. Its totient is φ = 1009853775360.

The previous prime is 2561358011629. The next prime is 2561358011651. The reversal of 2561358011650 is 561108531652.

It can be written as a sum of positive squares in 12 ways, for example, as 769864101561 + 1791493910089 = 877419^2 + 1338467^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2561358011597 and 2561358011606.

It is not an unprimeable number, because it can be changed into a prime (2561358011651) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5427336 + ... + 5880364.

Almost surely, 2^{2561358011650} is an apocalyptic number.

2561358011650 is a deficient number, since it is larger than the sum of its proper divisors (2271158301350).

2561358011650 is a wasteful number, since it uses less digits than its factorization.

2561358011650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454663 (or 454658 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 2561358011650 in words is "two trillion, five hundred sixty-one billion, three hundred fifty-eight million, eleven thousand, six hundred fifty".