6643373066 has 16 divisors (see below), whose sum is σ = 11443131360. Its totient is φ = 2860782480.

The previous prime is 6643373063. The next prime is 6643373081. The reversal of 6643373066 is 6603733466.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6643373063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7946201 + ... + 7947036.

It is an arithmetic number, because the mean of its divisors is an integer number (715195710).

Almost surely, 2^6643373066 is an apocalyptic number.

6643373066 is a deficient number, since it is larger than the sum of its proper divisors (4799758294).

6643373066 is a wasteful number, since it uses less digits than its factorization.

6643373066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15893269.

The product of its (nonzero) digits is 979776, while the sum is 44.

The square root of 6643373066 is about 81506.8896842469. The cubic root of 6643373066 is about 1879.8774880555.

The spelling of 6643373066 in words is "six billion, six hundred forty-three million, three hundred seventy-three thousand, sixty-six".