643441105611 has 12 divisors (see below), whose sum is σ = 929450959320. Its totient is φ = 428944108320.

The previous prime is 643441105603. The next prime is 643441105679. The reversal of 643441105611 is 116501144346.

643441105611 is a `hidden beast` number, since 6 + 4 + 34 + 4 + 1 + 1 + 0 + 5 + 611 = 666.

It is not a de Polignac number, because 643441105611 - 2³ = 643441105603 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643441105691) 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 11 ways as a sum of consecutive naturals, for example, 1138341 + ... + 1607078.

It is an arithmetic number, because the mean of its divisors is an integer number (77454246610).

Almost surely, 2^643441105611 is an apocalyptic number.

643441105611 is a deficient number, since it is larger than the sum of its proper divisors (286009853709).

643441105611 is a wasteful number, since it uses less digits than its factorization.

643441105611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771466 (or 2771463 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 643441105611 its reverse (116501144346), we get a palindrome (759942249957).

The spelling of 643441105611 in words is "six hundred forty-three billion, four hundred forty-one million, one hundred five thousand, six hundred eleven".