643326414064 has 20 divisors (see below), whose sum is σ = 1246618821904. Its totient is φ = 321618331008.

The previous prime is 643326414053. The next prime is 643326414151. The reversal of 643326414064 is 460414623346.

It is a self number, because there is not a number n which added to its sum of digits gives 643326414064.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2686332 + ... + 2915995.

Almost surely, 2^643326414064 is an apocalyptic number.

It is an amenable number.

643326414064 is a deficient number, since it is larger than the sum of its proper divisors (603292407840).

643326414064 is a wasteful number, since it uses less digits than its factorization.

643326414064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5609512 (or 5609506 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 43.

The spelling of 643326414064 in words is "six hundred forty-three billion, three hundred twenty-six million, four hundred fourteen thousand, sixty-four".