6673221281 has 4 divisors (see below), whose sum is σ = 6674999364. Its totient is φ = 6671443200.

The previous prime is 6673221271. The next prime is 6673221301. The reversal of 6673221281 is 1821223766.

It is a happy number.

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 2172958225 + 4500263056 = 46615^2 + 67084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6673221281 is a prime.

It is a super-2 number, since 2×6673221281² = 89063764530382561922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6673221241) 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, 883400 + ... + 890921.

It is an arithmetic number, because the mean of its divisors is an integer number (1668749841).

Almost surely, 2^6673221281 is an apocalyptic number.

It is an amenable number.

6673221281 is a deficient number, since it is larger than the sum of its proper divisors (1778083).

6673221281 is a wasteful number, since it uses less digits than its factorization.

6673221281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1778082.

The product of its digits is 48384, while the sum is 38.

The square root of 6673221281 is about 81689.7868830615. The cubic root of 6673221281 is about 1882.6886685482.

The spelling of 6673221281 in words is "six billion, six hundred seventy-three million, two hundred twenty-one thousand, two hundred eighty-one".