643676714774912 has 384 divisors, whose sum is σ = 1613321709016320. Its totient is φ = 250406459596800.

The previous prime is 643676714774911. The next prime is 643676714774923. The reversal of 643676714774912 is 219477417676346.

It is a self number, because there is not a number n which added to its sum of digits gives 643676714774912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643676714774911) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68454394403 + ... + 68454403805.

It is an arithmetic number, because the mean of its divisors is an integer number (4201358617230).

Almost surely, 2^{643676714774912} 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 643676714774912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (806660854508160).

643676714774912 is an abundant number, since it is smaller than the sum of its proper divisors (969644994241408).

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

643676714774912 is a wasteful number, since it uses less digits than its factorization.

643676714774912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16922 (or 16897 counting only the distinct ones).

The product of its digits is 1792336896, while the sum is 74.

The spelling of 643676714774912 in words is "six hundred forty-three trillion, six hundred seventy-six billion, seven hundred fourteen million, seven hundred seventy-four thousand, nine hundred twelve".