6645255 has 8 divisors (see below), whose sum is σ = 10632432. Its totient is φ = 3544128.

The previous prime is 6645227. The next prime is 6645259. The reversal of 6645255 is 5525466.

It is a happy number.

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

It is not a de Polignac number, because 6645255 - 2¹³ = 6637063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 221494 + ... + 221523.

It is an arithmetic number, because the mean of its divisors is an integer number (1329054).

Almost surely, 2^6645255 is an apocalyptic number.

6645255 is a deficient number, since it is larger than the sum of its proper divisors (3987177).

6645255 is a wasteful number, since it uses less digits than its factorization.

6645255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443025.

The product of its digits is 36000, while the sum is 33.

The square root of 6645255 is about 2577.8392114327. The cubic root of 6645255 is about 188.0054981793.

The spelling of 6645255 in words is "six million, six hundred forty-five thousand, two hundred fifty-five".