643603545205 has 8 divisors (see below), whose sum is σ = 805903569792. Its totient is φ = 492496625808.

The previous prime is 643603545203. The next prime is 643603545209. The reversal of 643603545205 is 502545306346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 643603545205 - 2¹ = 643603545203 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 2798276169 + ... + 2798276398.

It is an arithmetic number, because the mean of its divisors is an integer number (100737946224).

Almost surely, 2^643603545205 is an apocalyptic number.

It is an amenable number.

643603545205 is a deficient number, since it is larger than the sum of its proper divisors (162300024587).

643603545205 is a wasteful number, since it uses less digits than its factorization.

643603545205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5596552595.

The product of its (nonzero) digits is 1296000, while the sum is 43.

The spelling of 643603545205 in words is "six hundred forty-three billion, six hundred three million, five hundred forty-five thousand, two hundred five".