6643343165 has 12 divisors (see below), whose sum is σ = 8104865652. Its totient is φ = 5227534080.

The previous prime is 6643343159. The next prime is 6643343177. The reversal of 6643343165 is 5613433466.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5025533881 + 1617809284 = 70891^2 + 40222^2 .

It is not a de Polignac number, because 6643343165 - 2⁴ = 6643343149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159932 + ... + 197141.

It is an arithmetic number, because the mean of its divisors is an integer number (675405471).

Almost surely, 2^6643343165 is an apocalyptic number.

It is an amenable number.

6643343165 is a deficient number, since it is larger than the sum of its proper divisors (1461522487).

6643343165 is an equidigital number, since it uses as much as digits as its factorization.

6643343165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357200 (or 357139 counting only the distinct ones).

The product of its digits is 466560, while the sum is 41.

The square root of 6643343165 is about 81506.7062578289. The cubic root of 6643343165 is about 1879.8746676860.

The spelling of 6643343165 in words is "six billion, six hundred forty-three million, three hundred forty-three thousand, one hundred sixty-five".