2561061186 has 64 divisors (see below), whose sum is σ = 6343228800. Its totient is φ = 761177088.

The previous prime is 2561061103. The next prime is 2561061193. The reversal of 2561061186 is 6811601652.

2561061186 is a `hidden beast` number, since 2 + 561 + 0 + 6 + 11 + 86 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 2561061186.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55975 + ... + 90858.

It is an arithmetic number, because the mean of its divisors is an integer number (99112950).

Almost surely, 2^2561061186 is an apocalyptic number.

2561061186 is an abundant number, since it is smaller than the sum of its proper divisors (3782167614).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2561061186 is a wasteful number, since it uses less digits than its factorization.

2561061186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146880 (or 146874 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 2561061186 is about 50606.9282411015. The cubic root of 2561061186 is about 1368.1697523267.

The spelling of 2561061186 in words is "two billion, five hundred sixty-one million, sixty-one thousand, one hundred eighty-six".