643011334543 has 4 divisors (see below), whose sum is σ = 655143623928. Its totient is φ = 630879045160.

The previous prime is 643011334517. The next prime is 643011334571. The reversal of 643011334543 is 345433110346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 345433110346 = 2 ⋅172716555173.

It is a cyclic number.

It is not a de Polignac number, because 643011334543 - 2¹³ = 643011326351 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 (643011334583) 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, 6066144613 + ... + 6066144718.

It is an arithmetic number, because the mean of its divisors is an integer number (163785905982).

Almost surely, 2^643011334543 is an apocalyptic number.

643011334543 is a deficient number, since it is larger than the sum of its proper divisors (12132289385).

643011334543 is a wasteful number, since it uses less digits than its factorization.

643011334543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12132289384.

The product of its (nonzero) digits is 155520, while the sum is 37.

Adding to 643011334543 its reverse (345433110346), we get a palindrome (988444444889).

The spelling of 643011334543 in words is "six hundred forty-three billion, eleven million, three hundred thirty-four thousand, five hundred forty-three".