6446979443 has 4 divisors (see below), whose sum is σ = 6461532888. Its totient is φ = 6432426000.

The previous prime is 6446979437. The next prime is 6446979503. The reversal of 6446979443 is 3449796446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6446979443 - 2³² = 2152012147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6446973443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7276058 + ... + 7276943.

It is an arithmetic number, because the mean of its divisors is an integer number (1615383222).

Almost surely, 2^6446979443 is an apocalyptic number.

6446979443 is a deficient number, since it is larger than the sum of its proper divisors (14553445).

6446979443 is a wasteful number, since it uses less digits than its factorization.

6446979443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14553444.

The product of its digits is 15676416, while the sum is 56.

The square root of 6446979443 is about 80293.0846524157. The cubic root of 6446979443 is about 1861.1673639850.

The spelling of 6446979443 in words is "six billion, four hundred forty-six million, nine hundred seventy-nine thousand, four hundred forty-three".