6543645 has 16 divisors (see below), whose sum is σ = 10668672. Its totient is φ = 3423680.

The previous prime is 6543643. The next prime is 6543659. The reversal of 6543645 is 5463456.

It is not a de Polignac number, because 6543645 - 2¹ = 6543643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3321 + ... + 4910.

It is an arithmetic number, because the mean of its divisors is an integer number (666792).

Almost surely, 2^6543645 is an apocalyptic number.

It is an amenable number.

6543645 is a deficient number, since it is larger than the sum of its proper divisors (4125027).

6543645 is a wasteful number, since it uses less digits than its factorization.

6543645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8292.

The product of its digits is 43200, while the sum is 33.

The square root of 6543645 is about 2558.0549251335. The cubic root of 6543645 is about 187.0423326811.

The spelling of 6543645 in words is "six million, five hundred forty-three thousand, six hundred forty-five".