2566576661 has 8 divisors (see below), whose sum is σ = 2801663424. Its totient is φ = 2331783520.

The previous prime is 2566576651. The next prime is 2566576681. The reversal of 2566576661 is 1666756652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2566576661 - 2²⁶ = 2499467797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2566576651) 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 7 ways as a sum of consecutive naturals, for example, 54920 + ... + 90273.

It is an arithmetic number, because the mean of its divisors is an integer number (350207928).

Almost surely, 2^2566576661 is an apocalyptic number.

It is an amenable number.

2566576661 is a deficient number, since it is larger than the sum of its proper divisors (235086763).

2566576661 is a wasteful number, since it uses less digits than its factorization.

2566576661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146811.

The product of its digits is 2721600, while the sum is 50.

The square root of 2566576661 is about 50661.3922134005. The cubic root of 2566576661 is about 1369.1512068771.

Subtracting from 2566576661 its reverse (1666756652), we obtain a square (899820009 = 29997²).

The spelling of 2566576661 in words is "two billion, five hundred sixty-six million, five hundred seventy-six thousand, six hundred sixty-one".