643803412736 has 288 divisors, whose sum is σ = 1505493319680. Its totient is φ = 271691366400.

The previous prime is 643803412729. The next prime is 643803412741. The reversal of 643803412736 is 637214308346.

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, 746005841 + ... + 746006703.

It is an arithmetic number, because the mean of its divisors is an integer number (5227407360).

Almost surely, 2^643803412736 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 643803412736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (752746659840).

643803412736 is an abundant number, since it is smaller than the sum of its proper divisors (861689906944).

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

643803412736 is a wasteful number, since it uses less digits than its factorization.

643803412736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173 (or 1159 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 47.

The spelling of 643803412736 in words is "six hundred forty-three billion, eight hundred three million, four hundred twelve thousand, seven hundred thirty-six".