6648661 has 2 divisors, whose sum is σ = 6648662. Its totient is φ = 6648660.

The previous prime is 6648647. The next prime is 6648701. The reversal of 6648661 is 1668466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4866436 + 1782225 = 2206^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 6648661 - 2¹¹ = 6646613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6648661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6649661) 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 as a sum of consecutive naturals, namely, 3324330 + 3324331.

It is an arithmetic number, because the mean of its divisors is an integer number (3324331).

Almost surely, 2^6648661 is an apocalyptic number.

It is an amenable number.

6648661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6648661 is an equidigital number, since it uses as much as digits as its factorization.

6648661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 6648661 is about 2578.4997576110. The cubic root of 6648661 is about 188.0376131925.

The spelling of 6648661 in words is "six million, six hundred forty-eight thousand, six hundred sixty-one".