643434601305 has 32 divisors (see below), whose sum is σ = 1065278712960. Its totient is φ = 331243637760.

The previous prime is 643434601289. The next prime is 643434601339. The reversal of 643434601305 is 503106434346.

It is not a de Polignac number, because 643434601305 - 2⁴ = 643434601289 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1454970 + ... + 1844940.

It is an arithmetic number, because the mean of its divisors is an integer number (33289959780).

Almost surely, 2^643434601305 is an apocalyptic number.

It is an amenable number.

643434601305 is a deficient number, since it is larger than the sum of its proper divisors (421844111655).

643434601305 is a wasteful number, since it uses less digits than its factorization.

643434601305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393801.

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

The spelling of 643434601305 in words is "six hundred forty-three billion, four hundred thirty-four million, six hundred one thousand, three hundred five".