6645263 has 12 divisors (see below), whose sum is σ = 7131960. Its totient is φ = 6181056.

The previous prime is 6645259. The next prime is 6645293. The reversal of 6645263 is 3625466.

It is not a de Polignac number, because 6645263 - 2² = 6645259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645293) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90995 + ... + 91067.

It is an arithmetic number, because the mean of its divisors is an integer number (594330).

Almost surely, 2^6645263 is an apocalyptic number.

6645263 is a deficient number, since it is larger than the sum of its proper divisors (486697).

6645263 is an equidigital number, since it uses as much as digits as its factorization.

6645263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 145 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 6645263 is about 2577.8407631194. The cubic root of 6645263 is about 188.0055736238.

The spelling of 6645263 in words is "six million, six hundred forty-five thousand, two hundred sixty-three".