643105203313 has 16 divisors (see below), whose sum is σ = 646274280960. Its totient is φ = 639946958400.

The previous prime is 643105203203. The next prime is 643105203319. The reversal of 643105203313 is 313302501346.

It is a cyclic number.

It is not a de Polignac number, because 643105203313 - 2²¹ = 643103106161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643105203319) 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 15 ways as a sum of consecutive naturals, for example, 470449356 + ... + 470450722.

It is an arithmetic number, because the mean of its divisors is an integer number (40392142560).

Almost surely, 2^643105203313 is an apocalyptic number.

It is an amenable number.

643105203313 is a deficient number, since it is larger than the sum of its proper divisors (3169077647).

643105203313 is a wasteful number, since it uses less digits than its factorization.

643105203313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3888.

The product of its (nonzero) digits is 19440, while the sum is 31.

Adding to 643105203313 its reverse (313302501346), we get a palindrome (956407704659).

The spelling of 643105203313 in words is "six hundred forty-three billion, one hundred five million, two hundred three thousand, three hundred thirteen".