643603545204 has 48 divisors (see below), whose sum is σ = 1587994308096. Its totient is φ = 202550284800.

The previous prime is 643603545203. The next prime is 643603545209. The reversal of 643603545204 is 402545306346.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643603545203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21083737 + ... + 21114240.

It is an arithmetic number, because the mean of its divisors is an integer number (33083214752).

Almost surely, 2^643603545204 is an apocalyptic number.

It is an amenable number.

643603545204 is an abundant number, since it is smaller than the sum of its proper divisors (944390762892).

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

643603545204 is a wasteful number, since it uses less digits than its factorization.

643603545204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42198056 (or 42198054 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 42.

The spelling of 643603545204 in words is "six hundred forty-three billion, six hundred three million, five hundred forty-five thousand, two hundred four".