643305600403212 has 12 divisors (see below), whose sum is σ = 1501046400940856. Its totient is φ = 214435200134400.

The previous prime is 643305600403181. The next prime is 643305600403261. The reversal of 643305600403212 is 212304006503346.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26804400016789 + ... + 26804400016812.

Almost surely, 2^{643305600403212} is an apocalyptic number.

It is an amenable number.

643305600403212 is an abundant number, since it is smaller than the sum of its proper divisors (857740800537644).

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

643305600403212 is a wasteful number, since it uses less digits than its factorization.

643305600403212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53608800033608 (or 53608800033606 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 39.

Adding to 643305600403212 its reverse (212304006503346), we get a palindrome (855609606906558).

The spelling of 643305600403212 in words is "six hundred forty-three trillion, three hundred five billion, six hundred million, four hundred three thousand, two hundred twelve".