6645765 has 32 divisors (see below), whose sum is σ = 12257280. Its totient is φ = 3011904.

The previous prime is 6645757. The next prime is 6645787. The reversal of 6645765 is 5675466.

It is not a de Polignac number, because 6645765 - 2³ = 6645757 is a prime.

It is an Ulam number.

6645765 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17346 + ... + 17724.

It is an arithmetic number, because the mean of its divisors is an integer number (383040).

Almost surely, 2^6645765 is an apocalyptic number.

It is an amenable number.

6645765 is a deficient number, since it is larger than the sum of its proper divisors (5611515).

6645765 is a wasteful number, since it uses less digits than its factorization.

6645765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561.

The product of its digits is 151200, while the sum is 39.

The square root of 6645765 is about 2577.9381295912. The cubic root of 6645765 is about 188.0103076437.

Subtracting from 6645765 its reverse (5675466), we obtain a cube (970299 = 99³).

The spelling of 6645765 in words is "six million, six hundred forty-five thousand, seven hundred sixty-five".