6646957 has 2 divisors, whose sum is σ = 6646958. Its totient is φ = 6646956.

The previous prime is 6646951. The next prime is 6646967. The reversal of 6646957 is 7596466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6245001 + 401956 = 2499^2 + 634^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646957 - 2¹⁵ = 6614189 is a prime.

6646957 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6646951) 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, 3323478 + 3323479.

It is an arithmetic number, because the mean of its divisors is an integer number (3323479).

Almost surely, 2^6646957 is an apocalyptic number.

It is an amenable number.

6646957 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646957 is an equidigital number, since it uses as much as digits as its factorization.

6646957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 6646957 is about 2578.1693117404. The cubic root of 6646957 is about 188.0215476283.

The spelling of 6646957 in words is "six million, six hundred forty-six thousand, nine hundred fifty-seven".