6681344143447 has 4 divisors (see below), whose sum is σ = 6772869405760. Its totient is φ = 6589818881136.

The previous prime is 6681344143433. The next prime is 6681344143451. The reversal of 6681344143447 is 7443414431866.

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 6681344143447 - 2⁷ = 6681344143319 is a prime.

It is a super-3 number, since 3×6681344143447³ (a number of 39 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681344143457) 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, 45762631047 + ... + 45762631192.

It is an arithmetic number, because the mean of its divisors is an integer number (1693217351440).

Almost surely, 2^{6681344143447} is an apocalyptic number.

6681344143447 is a deficient number, since it is larger than the sum of its proper divisors (91525262313).

6681344143447 is an equidigital number, since it uses as much as digits as its factorization.

6681344143447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91525262312.

The product of its digits is 18579456, while the sum is 55.

The spelling of 6681344143447 in words is "six trillion, six hundred eighty-one billion, three hundred forty-four million, one hundred forty-three thousand, four hundred forty-seven".