643106752871 has 12 divisors (see below), whose sum is σ = 718266063240. Its totient is φ = 571046147280.

The previous prime is 643106752843. The next prime is 643106753041. The reversal of 643106752871 is 178257601346.

643106752871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-643106752871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643106752801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15789356 + ... + 15830033.

It is an arithmetic number, because the mean of its divisors is an integer number (59855505270).

Almost surely, 2^643106752871 is an apocalyptic number.

643106752871 is a deficient number, since it is larger than the sum of its proper divisors (75159310369).

643106752871 is a wasteful number, since it uses less digits than its factorization.

643106752871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31619486 (or 31619443 counting only the distinct ones).

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 643106752871 in words is "six hundred forty-three billion, one hundred six million, seven hundred fifty-two thousand, eight hundred seventy-one".