643123568508 has 48 divisors (see below), whose sum is σ = 1506411481344. Its totient is φ = 213548244480.

The previous prime is 643123568489. The next prime is 643123568569. The reversal of 643123568508 is 805865321346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6200313 + ... + 6303183.

It is an arithmetic number, because the mean of its divisors is an integer number (31383572528).

Almost surely, 2^643123568508 is an apocalyptic number.

It is an amenable number.

643123568508 is an abundant number, since it is smaller than the sum of its proper divisors (863287912836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643123568508 is a wasteful number, since it uses less digits than its factorization.

643123568508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104882 (or 104880 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 51.

The spelling of 643123568508 in words is "six hundred forty-three billion, one hundred twenty-three million, five hundred sixty-eight thousand, five hundred eight".