6645043 has 4 divisors (see below), whose sum is σ = 6652368. Its totient is φ = 6637720.

The previous prime is 6645019. The next prime is 6645047. The reversal of 6645043 is 3405466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6645043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6645047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2071 + ... + 4192.

It is an arithmetic number, because the mean of its divisors is an integer number (1663092).

Almost surely, 2^6645043 is an apocalyptic number.

6645043 is a deficient number, since it is larger than the sum of its proper divisors (7325).

6645043 is a wasteful number, since it uses less digits than its factorization.

6645043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7324.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 6645043 is about 2577.7980913951. The cubic root of 6645043 is about 188.0034988786.

The spelling of 6645043 in words is "six million, six hundred forty-five thousand, forty-three".