6445143829 has 4 divisors (see below), whose sum is σ = 6445609420. Its totient is φ = 6444678240.

The previous prime is 6445143827. The next prime is 6445143839. The reversal of 6445143829 is 9283415446.

6445143829 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 188650225 + 6256493604 = 13735^2 + 79098^2 .

It is a cyclic number.

It is not a de Polignac number, because 6445143829 - 2¹ = 6445143827 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 (6445143827) 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, 211374 + ... + 239935.

It is an arithmetic number, because the mean of its divisors is an integer number (1611402355).

Almost surely, 2^6445143829 is an apocalyptic number.

It is an amenable number.

6445143829 is a deficient number, since it is larger than the sum of its proper divisors (465591).

6445143829 is a wasteful number, since it uses less digits than its factorization.

6445143829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 465590.

The product of its digits is 829440, while the sum is 46.

The square root of 6445143829 is about 80281.6531282210. The cubic root of 6445143829 is about 1860.9907071390.

The spelling of 6445143829 in words is "six billion, four hundred forty-five million, one hundred forty-three thousand, eight hundred twenty-nine".