643115124543 has 4 divisors (see below), whose sum is σ = 857486832728. Its totient is φ = 428743416360.

The previous prime is 643115124539. The next prime is 643115124551. The reversal of 643115124543 is 345421511346.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 643115124543 - 2² = 643115124539 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 (643115124503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107185854088 + ... + 107185854093.

It is an arithmetic number, because the mean of its divisors is an integer number (214371708182).

Almost surely, 2^643115124543 is an apocalyptic number.

643115124543 is a deficient number, since it is larger than the sum of its proper divisors (214371708185).

643115124543 is a wasteful number, since it uses less digits than its factorization.

643115124543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214371708184.

The product of its digits is 172800, while the sum is 39.

Adding to 643115124543 its reverse (345421511346), we get a palindrome (988536635889).

The spelling of 643115124543 in words is "six hundred forty-three billion, one hundred fifteen million, one hundred twenty-four thousand, five hundred forty-three".