2561244026855 has 8 divisors (see below), whose sum is σ = 3089094319872. Its totient is φ = 2038594229728.

The previous prime is 2561244026837. The next prime is 2561244026867. The reversal of 2561244026855 is 5586204421652.

2561244026855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2561244026855 - 2⁶ = 2561244026791 is a prime.

It is a super-2 number, since 2×2561244026855² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 1300122887 + ... + 1300124856.

It is an arithmetic number, because the mean of its divisors is an integer number (386136789984).

Almost surely, 2^{2561244026855} is an apocalyptic number.

2561244026855 is a deficient number, since it is larger than the sum of its proper divisors (527850293017).

2561244026855 is a wasteful number, since it uses less digits than its factorization.

2561244026855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2600247945.

The product of its (nonzero) digits is 4608000, while the sum is 50.

The spelling of 2561244026855 in words is "two trillion, five hundred sixty-one billion, two hundred forty-four million, twenty-six thousand, eight hundred fifty-five".