6643446255 has 56 divisors (see below), whose sum is σ = 12149088480. Its totient is φ = 3484969920.

The previous prime is 6643446253. The next prime is 6643446259. The reversal of 6643446255 is 5526443466.

It is a happy number.

It is not a de Polignac number, because 6643446255 - 2¹ = 6643446253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 6643446255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643446253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 207406 + ... + 237284.

Almost surely, 2^6643446255 is an apocalyptic number.

6643446255 is a deficient number, since it is larger than the sum of its proper divisors (5505642225).

6643446255 is an equidigital number, since it uses as much as digits as its factorization.

6643446255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29963 (or 29948 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 45.

The square root of 6643446255 is about 81507.3386573258. The cubic root of 6643446255 is about 1879.8843914687.

The spelling of 6643446255 in words is "six billion, six hundred forty-three million, four hundred forty-six thousand, two hundred fifty-five".