2561613052185 has 48 divisors (see below), whose sum is σ = 4848925768128. Its totient is φ = 1240674115200.

The previous prime is 2561613052133. The next prime is 2561613052217. The reversal of 2561613052185 is 5812503161652.

2561613052185 is a `hidden beast` number, since 2 + 5 + 6 + 1 + 613 + 0 + 5 + 21 + 8 + 5 = 666.

It is not a de Polignac number, because 2561613052185 - 2¹⁵ = 2561613019417 is a prime.

It is a super-2 number, since 2×2561613052185² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2561613052185.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2283927 + ... + 3215516.

It is an arithmetic number, because the mean of its divisors is an integer number (101019286836).

Almost surely, 2^{2561613052185} is an apocalyptic number.

It is an amenable number.

2561613052185 is a deficient number, since it is larger than the sum of its proper divisors (2287312715943).

2561613052185 is a wasteful number, since it uses less digits than its factorization.

2561613052185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5500406 (or 5500403 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 45.

The spelling of 2561613052185 in words is "two trillion, five hundred sixty-one billion, six hundred thirteen million, fifty-two thousand, one hundred eighty-five".