2656776561 has 16 divisors (see below), whose sum is σ = 3578359680. Its totient is φ = 1753230080.

The previous prime is 2656776559. The next prime is 2656776571. The reversal of 2656776561 is 1656776562.

It is a cyclic number.

It is not a de Polignac number, because 2656776561 - 2¹ = 2656776559 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2656776511) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 279751 + ... + 289091.

It is an arithmetic number, because the mean of its divisors is an integer number (223647480).

Almost surely, 2^2656776561 is an apocalyptic number.

It is an amenable number.

2656776561 is a deficient number, since it is larger than the sum of its proper divisors (921583119).

2656776561 is a wasteful number, since it uses less digits than its factorization.

2656776561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10296.

The product of its digits is 3175200, while the sum is 51.

The square root of 2656776561 is about 51543.9284591309. The cubic root of 2656776561 is about 1385.0060708636.

Subtracting from 2656776561 its reverse (1656776562), we obtain a palindrome (999999999).

The spelling of 2656776561 in words is "two billion, six hundred fifty-six million, seven hundred seventy-six thousand, five hundred sixty-one".