6446661 has 16 divisors (see below), whose sum is σ = 9456384. Its totient is φ = 3881664.

The previous prime is 6446659. The next prime is 6446669. The reversal of 6446661 is 1666446.

It is not a de Polignac number, because 6446661 - 2¹ = 6446659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6446669) 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 in 15 ways as a sum of consecutive naturals, for example, 75 + ... + 3591.

It is an arithmetic number, because the mean of its divisors is an integer number (591024).

Almost surely, 2^6446661 is an apocalyptic number.

It is an amenable number.

6446661 is a deficient number, since it is larger than the sum of its proper divisors (3009723).

6446661 is a wasteful number, since it uses less digits than its factorization.

6446661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580.

The product of its digits is 20736, while the sum is 33.

The square root of 6446661 is about 2539.0275697597. The cubic root of 6446661 is about 186.1136719894.

The spelling of 6446661 in words is "six million, four hundred forty-six thousand, six hundred sixty-one".