643471086430744 has 96 divisors (see below), whose sum is σ = 1429078987602000. Its totient is φ = 269816873483520.

The previous prime is 643471086430717. The next prime is 643471086430817. The reversal of 643471086430744 is 447034680174346.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3678222 + ... + 36062050.

Almost surely, 2^{643471086430744} 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 643471086430744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (714539493801000).

643471086430744 is an abundant number, since it is smaller than the sum of its proper divisors (785607901171256).

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

643471086430744 is a wasteful number, since it uses less digits than its factorization.

643471086430744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32385449 (or 32385434 counting only the distinct ones).

The product of its (nonzero) digits is 130056192, while the sum is 61.

The spelling of 643471086430744 in words is "six hundred forty-three trillion, four hundred seventy-one billion, eighty-six million, four hundred thirty thousand, seven hundred forty-four".