6643355446 has 32 divisors (see below), whose sum is σ = 12271710528. Its totient is φ = 2626629120.

The previous prime is 6643355429. The next prime is 6643355461. The reversal of 6643355446 is 6445533466.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6643355396 and 6643355405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 338626 + ... + 357706.

It is an arithmetic number, because the mean of its divisors is an integer number (383490954).

Almost surely, 2^6643355446 is an apocalyptic number.

6643355446 is a deficient number, since it is larger than the sum of its proper divisors (5628355082).

6643355446 is a wasteful number, since it uses less digits than its factorization.

6643355446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21016.

The product of its digits is 3110400, while the sum is 46.

The square root of 6643355446 is about 81506.7815951532. The cubic root of 6643355446 is about 1879.8758260749.

The spelling of 6643355446 in words is "six billion, six hundred forty-three million, three hundred fifty-five thousand, four hundred forty-six".