6648561 has 20 divisors (see below), whose sum is σ = 10067200. Its totient is φ = 4372056.

The previous prime is 6648517. The next prime is 6648571. The reversal of 6648561 is 1658466.

6648561 is a `hidden beast` number, since 6 + 648 + 5 + 6 + 1 = 666.

It is not a de Polignac number, because 6648561 - 2¹¹ = 6646513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6648571) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 5880 + ... + 6918.

It is an arithmetic number, because the mean of its divisors is an integer number (503360).

Almost surely, 2^6648561 is an apocalyptic number.

It is an amenable number.

6648561 is a deficient number, since it is larger than the sum of its proper divisors (3418639).

6648561 is a wasteful number, since it uses less digits than its factorization.

6648561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1121 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 6648561 is about 2578.4803664174. The cubic root of 6648561 is about 188.0366704535.

The spelling of 6648561 in words is "six million, six hundred forty-eight thousand, five hundred sixty-one".