643242221163 has 128 divisors (see below), whose sum is σ = 1016409600000. Its totient is φ = 401454144000.

The previous prime is 643242221159. The next prime is 643242221173. The reversal of 643242221163 is 361122242346.

643242221163 is a `hidden beast` number, since 6 + 432 + 4 + 2 + 2 + 211 + 6 + 3 = 666.

It is not a de Polignac number, because 643242221163 - 2² = 643242221159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643242221123) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 930885648 + ... + 930886338.

It is an arithmetic number, because the mean of its divisors is an integer number (7940700000).

Almost surely, 2^643242221163 is an apocalyptic number.

643242221163 is a deficient number, since it is larger than the sum of its proper divisors (373167378837).

643242221163 is a wasteful number, since it uses less digits than its factorization.

643242221163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1052 counting only the distinct ones).

The product of its digits is 82944, while the sum is 36.

The spelling of 643242221163 in words is "six hundred forty-three billion, two hundred forty-two million, two hundred twenty-one thousand, one hundred sixty-three".