5605209281781 has 12 divisors (see below), whose sum is σ = 8101184444652. Its totient is φ = 3734604170496.

The previous prime is 5605209281779. The next prime is 5605209281801. The reversal of 5605209281781 is 1871829025065.

5605209281781 is a `hidden beast` number, since 5 + 6 + 0 + 520 + 9 + 28 + 17 + 81 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5418494550756 + 186714731025 = 2327766^2 + 432105^2 .

It is not a de Polignac number, because 5605209281781 - 2¹ = 5605209281779 is a prime.

It is a super-2 number, since 2×5605209281781² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5605209281741) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183485326 + ... + 183515871.

It is an arithmetic number, because the mean of its divisors is an integer number (675098703721).

Almost surely, 2^{5605209281781} is an apocalyptic number.

It is an amenable number.

5605209281781 is a deficient number, since it is larger than the sum of its proper divisors (2495975162871).

5605209281781 is a wasteful number, since it uses less digits than its factorization.

5605209281781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367002900 (or 367002897 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 54.

The spelling of 5605209281781 in words is "five trillion, six hundred five billion, two hundred nine million, two hundred eighty-one thousand, seven hundred eighty-one".