6645441 has 12 divisors (see below), whose sum is σ = 9739856. Its totient is φ = 4027320.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645441 is 1445466.

It is not a de Polignac number, because 6645441 - 2⁷ = 6645313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6645399 and 6645408.

It is not an unprimeable number, because it can be changed into a prime (6645461) 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 11 ways as a sum of consecutive naturals, for example, 8791 + ... + 9516.

Almost surely, 2^6645441 is an apocalyptic number.

It is an amenable number.

6645441 is a deficient number, since it is larger than the sum of its proper divisors (3094415).

6645441 is a wasteful number, since it uses less digits than its factorization.

6645441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18332 (or 18321 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 6645441 is about 2577.8752879067. The cubic root of 6645441 is about 188.0072522478.

It can be divided in two parts, 664 and 5441, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 6645441 in words is "six million, six hundred forty-five thousand, four hundred forty-one".