643843211160 has 128 divisors (see below), whose sum is σ = 1998461548800. Its totient is φ = 165743961600.

The previous prime is 643843211149. The next prime is 643843211183. The reversal of 643843211160 is 61112348346.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29454235 + ... + 29476085.

It is an arithmetic number, because the mean of its divisors is an integer number (15612980850).

Almost surely, 2^643843211160 is an apocalyptic number.

643843211160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643843211160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (999230774400).

643843211160 is an abundant number, since it is smaller than the sum of its proper divisors (1354618337640).

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

643843211160 is a wasteful number, since it uses less digits than its factorization.

643843211160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30361 (or 30357 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The spelling of 643843211160 in words is "six hundred forty-three billion, eight hundred forty-three million, two hundred eleven thousand, one hundred sixty".