6643163 has 4 divisors (see below), whose sum is σ = 6652848. Its totient is φ = 6633480.

The previous prime is 6643151. The next prime is 6643181. The reversal of 6643163 is 3613466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3613466 = 2 ⋅1806733.

It is a cyclic number.

It is not a de Polignac number, because 6643163 - 2⁸ = 6642907 is a prime.

It is a super-2 number, since 2×6643163² = 88263229289138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6643123) 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, 3728 + ... + 5213.

It is an arithmetic number, because the mean of its divisors is an integer number (1663212).

Almost surely, 2^6643163 is an apocalyptic number.

6643163 is a deficient number, since it is larger than the sum of its proper divisors (9685).

6643163 is an equidigital number, since it uses as much as digits as its factorization.

6643163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9684.

The product of its digits is 7776, while the sum is 29.

The square root of 6643163 is about 2577.4334133009. The cubic root of 6643163 is about 187.9857673698.

The spelling of 6643163 in words is "six million, six hundred forty-three thousand, one hundred sixty-three".