643289560836 has 192 divisors, whose sum is σ = 1688705894400. Its totient is φ = 189254983680.

The previous prime is 643289560829. The next prime is 643289560861. The reversal of 643289560836 is 638065982346.

It is a self number, because there is not a number n which added to its sum of digits gives 643289560836.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 190715646 + ... + 190719018.

It is an arithmetic number, because the mean of its divisors is an integer number (8795343200).

Almost surely, 2^643289560836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643289560836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844352947200).

643289560836 is an abundant number, since it is smaller than the sum of its proper divisors (1045416333564).

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

643289560836 is a wasteful number, since it uses less digits than its factorization.

643289560836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3886 (or 3884 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 60.

The spelling of 643289560836 in words is "six hundred forty-three billion, two hundred eighty-nine million, five hundred sixty thousand, eight hundred thirty-six".