6643345704555 has 32 divisors (see below), whose sum is σ = 12176824665600. Its totient is φ = 3029709906432.

The previous prime is 6643345704553. The next prime is 6643345704563. The reversal of 6643345704555 is 5554075433466.

It is not a de Polignac number, because 6643345704555 - 2¹ = 6643345704553 is a prime.

It is a Smith number, since the sum of its digits (57) 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 = 6643345704495 and 6643345704504.

It is not an unprimeable number, because it can be changed into a prime (6643345704553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75457150 + ... + 75545139.

It is an arithmetic number, because the mean of its divisors is an integer number (380525770800).

Almost surely, 2^{6643345704555} is an apocalyptic number.

6643345704555 is a deficient number, since it is larger than the sum of its proper divisors (5533478961045).

6643345704555 is a wasteful number, since it uses less digits than its factorization.

6643345704555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151002723.

The product of its (nonzero) digits is 90720000, while the sum is 57.

The spelling of 6643345704555 in words is "six trillion, six hundred forty-three billion, three hundred forty-five million, seven hundred four thousand, five hundred fifty-five".