6645423 has 4 divisors (see below), whose sum is σ = 8860568. Its totient is φ = 4430280.

The previous prime is 6645391. The next prime is 6645461. The reversal of 6645423 is 3245466.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6645423 - 2⁵ = 6645391 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645493) 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, 1107568 + ... + 1107573.

It is an arithmetic number, because the mean of its divisors is an integer number (2215142).

Almost surely, 2^6645423 is an apocalyptic number.

6645423 is a deficient number, since it is larger than the sum of its proper divisors (2215145).

6645423 is a wasteful number, since it uses less digits than its factorization.

6645423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215144.

The product of its digits is 17280, while the sum is 30.

The square root of 6645423 is about 2577.8717966571. The cubic root of 6645423 is about 188.0070825006.

The spelling of 6645423 in words is "six million, six hundred forty-five thousand, four hundred twenty-three".