2566561716 has 18 divisors (see below), whose sum is σ = 6487697762. Its totient is φ = 855520560.

The previous prime is 2566561687. The next prime is 2566561783. The reversal of 2566561716 is 6171656652.

2566561716 is a `hidden beast` number, since 25 + 6 + 6 + 5 + 617 + 1 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1934240400 + 632321316 = 43980^2 + 25146^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35646655 + ... + 35646726.

Almost surely, 2^2566561716 is an apocalyptic number.

It is an amenable number.

2566561716 is an abundant number, since it is smaller than the sum of its proper divisors (3921136046).

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

2566561716 is a wasteful number, since it uses less digits than its factorization.

2566561716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71293391 (or 71293386 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 2566561716 is about 50661.2447142784. The cubic root of 2566561716 is about 1369.1485493807.

The spelling of 2566561716 in words is "two billion, five hundred sixty-six million, five hundred sixty-one thousand, seven hundred sixteen".