643649054608 has 200 divisors, whose sum is σ = 1547356205920. Its totient is φ = 258608609280.

The previous prime is 643649054597. The next prime is 643649054611. The reversal of 643649054608 is 806450946346.

643649054608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 70796143 + ... + 70805233.

Almost surely, 2^643649054608 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 643649054608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773678102960).

643649054608 is an abundant number, since it is smaller than the sum of its proper divisors (903707151312).

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

643649054608 is an equidigital number, since it uses as much as digits as its factorization.

643649054608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9243 (or 9216 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 55.

The spelling of 643649054608 in words is "six hundred forty-three billion, six hundred forty-nine million, fifty-four thousand, six hundred eight".