643311355432 has 16 divisors (see below), whose sum is σ = 1206786785760. Its totient is φ = 321501545904.

The previous prime is 643311355411. The next prime is 643311355439. The reversal of 643311355432 is 234553113346.

It is not an unprimeable number, because it can be changed into a prime (643311355439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19248738 + ... + 19282129.

It is an arithmetic number, because the mean of its divisors is an integer number (75424174110).

Almost surely, 2^643311355432 is an apocalyptic number.

It is an amenable number.

643311355432 is a deficient number, since it is larger than the sum of its proper divisors (563475430328).

643311355432 is a wasteful number, since it uses less digits than its factorization.

643311355432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38532960 (or 38532956 counting only the distinct ones).

The product of its digits is 388800, while the sum is 40.

Adding to 643311355432 its reverse (234553113346), we get a palindrome (877864468778).

The spelling of 643311355432 in words is "six hundred forty-three billion, three hundred eleven million, three hundred fifty-five thousand, four hundred thirty-two".