643848806833 has 16 divisors (see below), whose sum is σ = 682364528640. Its totient is φ = 605797650000.

The previous prime is 643848806803. The next prime is 643848806849. The reversal of 643848806833 is 338608848346.

It is a cyclic number.

It is not a de Polignac number, because 643848806833 - 2¹³ = 643848798641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643848806803) 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 15 ways as a sum of consecutive naturals, for example, 15779208 + ... + 15819958.

It is an arithmetic number, because the mean of its divisors is an integer number (42647783040).

Almost surely, 2^643848806833 is an apocalyptic number.

It is an amenable number.

643848806833 is a deficient number, since it is larger than the sum of its proper divisors (38515721807).

643848806833 is a wasteful number, since it uses less digits than its factorization.

643848806833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46428.

The product of its (nonzero) digits is 63700992, while the sum is 61.

The spelling of 643848806833 in words is "six hundred forty-three billion, eight hundred forty-eight million, eight hundred six thousand, eight hundred thirty-three".