6671143821 has 4 divisors (see below), whose sum is σ = 8894858432. Its totient is φ = 4447429212.

The previous prime is 6671143819. The next prime is 6671143849. The reversal of 6671143821 is 1283411766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6671143821 - 2¹ = 6671143819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6671143821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6671143811) 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, 1111857301 + ... + 1111857306.

It is an arithmetic number, because the mean of its divisors is an integer number (2223714608).

Almost surely, 2^6671143821 is an apocalyptic number.

It is an amenable number.

6671143821 is a deficient number, since it is larger than the sum of its proper divisors (2223714611).

6671143821 is a wasteful number, since it uses less digits than its factorization.

6671143821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2223714610.

The product of its digits is 48384, while the sum is 39.

The square root of 6671143821 is about 81677.0703502519. The cubic root of 6671143821 is about 1882.4932798358.

The spelling of 6671143821 in words is "six billion, six hundred seventy-one million, one hundred forty-three thousand, eight hundred twenty-one".