6645673441 has 9 divisors (see below), whose sum is σ = 7305734289. Its totient is φ = 6040706100.

The previous prime is 6645673427. The next prime is 6645673457. The reversal of 6645673441 is 1443765466.

The square root of 6645673441 is 81521.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 6645673441 - 2³¹ = 4498189793 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6645673391 and 6645673400.

It is not an unprimeable number, because it can be changed into a prime (6645673481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 893026 + ... + 900436.

Almost surely, 2^6645673441 is an apocalyptic number.

6645673441 is the 81521-st square number.

6645673441 is the 40761-st centered octagonal number.

It is an amenable number.

6645673441 is a deficient number, since it is larger than the sum of its proper divisors (660060848).

6645673441 is an frugal number, since it uses more digits than its factorization.

6645673441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14844 (or 7422 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 46.

The cubic root of 6645673441 is about 1880.0944423093.

It can be divided in two parts, 6645 and 673441, that added together give a palindrome (680086).

The spelling of 6645673441 in words is "six billion, six hundred forty-five million, six hundred seventy-three thousand, four hundred forty-one".