2605581863613 has 24 divisors (see below), whose sum is σ = 4092710471928. Its totient is φ = 1590689083392.

The previous prime is 2605581863611. The next prime is 2605581863617. The reversal of 2605581863613 is 3163681855062.

It is a happy number.

2605581863613 is a `hidden beast` number, since 2 + 6 + 0 + 5 + 5 + 8 + 18 + 6 + 3 + 613 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 552313539684 + 2053268323929 = 743178^2 + 1432923^2 .

It is not a de Polignac number, because 2605581863613 - 2¹ = 2605581863611 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2605581863613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605581863611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 230128756 + ... + 230140077.

It is an arithmetic number, because the mean of its divisors is an integer number (170529602997).

Almost surely, 2^{2605581863613} is an apocalyptic number.

It is an amenable number.

2605581863613 is a deficient number, since it is larger than the sum of its proper divisors (1487128608315).

2605581863613 is a wasteful number, since it uses less digits than its factorization.

2605581863613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460268893 (or 460268890 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 54.

The spelling of 2605581863613 in words is "two trillion, six hundred five billion, five hundred eighty-one million, eight hundred sixty-three thousand, six hundred thirteen".