6466661 has 2 divisors, whose sum is σ = 6466662. Its totient is φ = 6466660.

The previous prime is 6466633. The next prime is 6466679. The reversal of 6466661 is 1666646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4866436 + 1600225 = 2206^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 6466661 - 2⁶ = 6466597 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6466261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233330 + 3233331.

It is an arithmetic number, because the mean of its divisors is an integer number (3233331).

Almost surely, 2^6466661 is an apocalyptic number.

It is an amenable number.

6466661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6466661 is an equidigital number, since it uses as much as digits as its factorization.

6466661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 35.

The square root of 6466661 is about 2542.9630355159. The cubic root of 6466661 is about 186.3059384850.

The spelling of 6466661 in words is "six million, four hundred sixty-six thousand, six hundred sixty-one".