6343479721 has 8 divisors (see below), whose sum is σ = 6378643080. Its totient is φ = 6308402688.

The previous prime is 6343479719. The next prime is 6343479733. The reversal of 6343479721 is 1279743436.

It can be written as a sum of positive squares in 4 ways, for example, as 26409321 + 6317070400 = 5139^2 + 79480^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6343479721 - 2¹ = 6343479719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6343479781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128665 + ... + 171001.

It is an arithmetic number, because the mean of its divisors is an integer number (797330385).

Almost surely, 2^6343479721 is an apocalyptic number.

It is an amenable number.

6343479721 is a deficient number, since it is larger than the sum of its proper divisors (35163359).

6343479721 is a wasteful number, since it uses less digits than its factorization.

6343479721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43163.

The product of its digits is 762048, while the sum is 46.

The square root of 6343479721 is about 79645.9648758178. The cubic root of 6343479721 is about 1851.1538670701.

The spelling of 6343479721 in words is "six billion, three hundred forty-three million, four hundred seventy-nine thousand, seven hundred twenty-one".