6666449 has 2 divisors, whose sum is σ = 6666450. Its totient is φ = 6666448.

The previous prime is 6666437. The next prime is 6666467. The reversal of 6666449 is 9446666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4870849 + 1795600 = 2207^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666449 - 2¹² = 6662353 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6666479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333224 + 3333225.

It is an arithmetic number, because the mean of its divisors is an integer number (3333225).

Almost surely, 2^6666449 is an apocalyptic number.

It is an amenable number.

6666449 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666449 is an equidigital number, since it uses as much as digits as its factorization.

6666449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 41.

The square root of 6666449 is about 2581.9467461588. The cubic root of 6666449 is about 188.2051574322.

The spelling of 6666449 in words is "six million, six hundred sixty-six thousand, four hundred forty-nine".