6645673 has 4 divisors (see below), whose sum is σ = 6686608. Its totient is φ = 6604740.

The previous prime is 6645641. The next prime is 6645677. The reversal of 6645673 is 3765466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6645673 - 2⁵ = 6645641 is a prime.

It is a Duffinian number.

6645673 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6645677) 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 3 ways as a sum of consecutive naturals, for example, 20223 + ... + 20548.

It is an arithmetic number, because the mean of its divisors is an integer number (1671652).

Almost surely, 2^6645673 is an apocalyptic number.

It is an amenable number.

6645673 is a deficient number, since it is larger than the sum of its proper divisors (40935).

6645673 is a wasteful number, since it uses less digits than its factorization.

6645673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40934.

The product of its digits is 90720, while the sum is 37.

The square root of 6645673 is about 2577.9202858118. The cubic root of 6645673 is about 188.0094400722.

The spelling of 6645673 in words is "six million, six hundred forty-five thousand, six hundred seventy-three".