643120550303 has 8 divisors (see below), whose sum is σ = 801812634240. Its totient is φ = 501132896280.

The previous prime is 643120550297. The next prime is 643120550327. The reversal of 643120550303 is 303055021346.

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 643120550303 - 2²⁰ = 643119501727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 643120550303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643120550333) 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, 4176107393 + ... + 4176107546.

It is an arithmetic number, because the mean of its divisors is an integer number (100226579280).

Almost surely, 2^643120550303 is an apocalyptic number.

643120550303 is a deficient number, since it is larger than the sum of its proper divisors (158692083937).

643120550303 is a wasteful number, since it uses less digits than its factorization.

643120550303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8352214957.

The product of its (nonzero) digits is 32400, while the sum is 32.

Adding to 643120550303 its reverse (303055021346), we get a palindrome (946175571649).

The spelling of 643120550303 in words is "six hundred forty-three billion, one hundred twenty million, five hundred fifty thousand, three hundred three".