643677732880 has 160 divisors (see below), whose sum is σ = 1855971710208. Its totient is φ = 202158028800.

The previous prime is 643677732857. The next prime is 643677732913. The reversal of 643677732880 is 88237776346.

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 31 ways as a sum of consecutive naturals, for example, 616210 + ... + 1291150.

Almost surely, 2^643677732880 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 643677732880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (927985855104).

643677732880 is an abundant number, since it is smaller than the sum of its proper divisors (1212293977328).

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

643677732880 is a wasteful number, since it uses less digits than its factorization.

643677732880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675105 (or 675099 counting only the distinct ones).

The product of its (nonzero) digits is 56899584, while the sum is 61.

The spelling of 643677732880 in words is "six hundred forty-three billion, six hundred seventy-seven million, seven hundred thirty-two thousand, eight hundred eighty".