6656254561 has 16 divisors (see below), whose sum is σ = 7382384640. Its totient is φ = 5950604880.

The previous prime is 6656254543. The next prime is 6656254571. The reversal of 6656254561 is 1654526566.

It is not a de Polignac number, because 6656254561 - 2⁹ = 6656254049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6656254571) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 439920 + ... + 454798.

It is an arithmetic number, because the mean of its divisors is an integer number (461399040).

Almost surely, 2^6656254561 is an apocalyptic number.

It is an amenable number.

6656254561 is a deficient number, since it is larger than the sum of its proper divisors (726130079).

6656254561 is a wasteful number, since it uses less digits than its factorization.

6656254561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15564.

The product of its digits is 1296000, while the sum is 46.

The square root of 6656254561 is about 81585.8723125518. The cubic root of 6656254561 is about 1881.0917305644.

The spelling of 6656254561 in words is "six billion, six hundred fifty-six million, two hundred fifty-four thousand, five hundred sixty-one".