643466536946496 has 168 divisors, whose sum is σ = 1859028284033024. Its totient is φ = 212785652782080.

The previous prime is 643466536946477. The next prime is 643466536946581. The reversal of 643466536946496 is 694649635664346.

643466536946496 is a `hidden beast` number, since 6 + 4 + 3 + 4 + 6 + 6 + 5 + 3 + 69 + 464 + 96 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1116816186 + ... + 1117392198.

Almost surely, 2^{643466536946496} 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 643466536946496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (929514142016512).

643466536946496 is an abundant number, since it is smaller than the sum of its proper divisors (1215561747086528).

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

643466536946496 is a wasteful number, since it uses less digits than its factorization.

643466536946496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591429 (or 591416 counting only the distinct ones).

The product of its digits is 43535646720, while the sum is 81.

The spelling of 643466536946496 in words is "six hundred forty-three trillion, four hundred sixty-six billion, five hundred thirty-six million, nine hundred forty-six thousand, four hundred ninety-six".