643065009503 has 16 divisors (see below), whose sum is σ = 757070054400. Its totient is φ = 534766682016.

The previous prime is 643065009493. The next prime is 643065009547. The reversal of 643065009503 is 305900560346.

It is not a de Polignac number, because 643065009503 - 2²⁴ = 643048232287 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 (643065009553) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 7124375 + ... + 7214072.

It is an arithmetic number, because the mean of its divisors is an integer number (47316878400).

Almost surely, 2^643065009503 is an apocalyptic number.

643065009503 is a deficient number, since it is larger than the sum of its proper divisors (114005044897).

643065009503 is a wasteful number, since it uses less digits than its factorization.

643065009503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14338646.

The product of its (nonzero) digits is 291600, while the sum is 41.

Adding to 643065009503 its reverse (305900560346), we get a palindrome (948965569849).

The spelling of 643065009503 in words is "six hundred forty-three billion, sixty-five million, nine thousand, five hundred three".