6645565 has 8 divisors (see below), whose sum is σ = 8144640. Its totient is φ = 5203152.

The previous prime is 6645557. The next prime is 6645571. The reversal of 6645565 is 5655466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6645565 - 2³ = 6645557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13905 + ... + 14374.

It is an arithmetic number, because the mean of its divisors is an integer number (1018080).

Almost surely, 2^6645565 is an apocalyptic number.

It is an amenable number.

6645565 is a deficient number, since it is larger than the sum of its proper divisors (1499075).

6645565 is a wasteful number, since it uses less digits than its factorization.

6645565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28331.

The product of its digits is 108000, while the sum is 37.

The square root of 6645565 is about 2577.8993386089. The cubic root of 6645565 is about 188.0084216086.

Subtracting from 6645565 its reverse (5655466), we obtain a palindrome (990099).

The spelling of 6645565 in words is "six million, six hundred forty-five thousand, five hundred sixty-five".