6843664943 has 4 divisors (see below), whose sum is σ = 6845315400. Its totient is φ = 6842014488.

The previous prime is 6843664931. The next prime is 6843664987. The reversal of 6843664943 is 3494663486.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3494663486 = 2 ⋅1747331743.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6843664943 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 (6843664043) 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, 818993 + ... + 827306.

It is an arithmetic number, because the mean of its divisors is an integer number (1711328850).

Almost surely, 2^6843664943 is an apocalyptic number.

6843664943 is a deficient number, since it is larger than the sum of its proper divisors (1650457).

6843664943 is a wasteful number, since it uses less digits than its factorization.

6843664943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650456.

The product of its digits is 8957952, while the sum is 53.

The square root of 6843664943 is about 82726.4464545649. The cubic root of 6843664943 is about 1898.5829640163.

The spelling of 6843664943 in words is "six billion, eight hundred forty-three million, six hundred sixty-four thousand, nine hundred forty-three".