643106752845 has 16 divisors (see below), whose sum is σ = 1046410989120. Its totient is φ = 337176873344.

The previous prime is 643106752843. The next prime is 643106753041. The reversal of 643106752845 is 548257601346.

It is a cyclic number.

It is not a de Polignac number, because 643106752845 - 2¹ = 643106752843 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643106752843) 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, 363336264 + ... + 363338033.

It is an arithmetic number, because the mean of its divisors is an integer number (65400686820).

Almost surely, 2^643106752845 is an apocalyptic number.

It is an amenable number.

643106752845 is a deficient number, since it is larger than the sum of its proper divisors (403304236275).

643106752845 is a wasteful number, since it uses less digits than its factorization.

643106752845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726674364.

The product of its (nonzero) digits is 4838400, while the sum is 51.

The spelling of 643106752845 in words is "six hundred forty-three billion, one hundred six million, seven hundred fifty-two thousand, eight hundred forty-five".