6836664421 has 4 divisors (see below), whose sum is σ = 7072411500. Its totient is φ = 6600917344.

The previous prime is 6836664397. The next prime is 6836664437. The reversal of 6836664421 is 1244666386.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2442830625 + 4393833796 = 49425^2 + 66286^2 .

It is a cyclic number.

It is not a de Polignac number, because 6836664421 - 2⁷ = 6836664293 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 (6836664451) 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, 117873496 + ... + 117873553.

It is an arithmetic number, because the mean of its divisors is an integer number (1768102875).

Almost surely, 2^6836664421 is an apocalyptic number.

It is an amenable number.

6836664421 is a deficient number, since it is larger than the sum of its proper divisors (235747079).

6836664421 is a wasteful number, since it uses less digits than its factorization.

6836664421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235747078.

The product of its digits is 995328, while the sum is 46.

The square root of 6836664421 is about 82684.1243589119. The cubic root of 6836664421 is about 1897.9353769706.

The spelling of 6836664421 in words is "six billion, eight hundred thirty-six million, six hundred sixty-four thousand, four hundred twenty-one".