643867481088 has 792 divisors, whose sum is σ = 2130406832736. Its totient is φ = 194088960000.

The previous prime is 643867481063. The next prime is 643867481161. The reversal of 643867481088 is 880184768346.

643867481088 is a `hidden beast` number, since 64 + 38 + 67 + 481 + 0 + 8 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2565208963 + ... + 2565209213.

Almost surely, 2^643867481088 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 643867481088, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1065203416368).

643867481088 is an abundant number, since it is smaller than the sum of its proper divisors (1486539351648).

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

643867481088 is a wasteful number, since it uses less digits than its factorization.

643867481088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 49545216, while the sum is 63.

The spelling of 643867481088 in words is "six hundred forty-three billion, eight hundred sixty-seven million, four hundred eighty-one thousand, eighty-eight".