12561204104644 has 12 divisors (see below), whose sum is σ = 23673038505004. Its totient is φ = 5797478817504.

The previous prime is 12561204104639. The next prime is 12561204104689. The reversal of 12561204104644 is 44640140216521.

12561204104644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5044120711744 + 7517083392900 = 2245912^2 + 2741730^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12561204104597 and 12561204104606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120780808647 + ... + 120780808750.

Almost surely, 2^{12561204104644} is an apocalyptic number.

It is an amenable number.

12561204104644 is a deficient number, since it is larger than the sum of its proper divisors (11111834400360).

12561204104644 is a wasteful number, since it uses less digits than its factorization.

12561204104644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241561617414 (or 241561617412 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 40.

The spelling of 12561204104644 in words is "twelve trillion, five hundred sixty-one billion, two hundred four million, one hundred four thousand, six hundred forty-four".