6666298221 has 8 divisors (see below), whose sum is σ = 9696433824. Its totient is φ = 4040180720.

The previous prime is 6666298211. The next prime is 6666298229. The reversal of 6666298221 is 1228926666.

It is a happy number.

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 6666298221 - 2⁵ = 6666298189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666298229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101004486 + ... + 101004551.

It is an arithmetic number, because the mean of its divisors is an integer number (1212054228).

Almost surely, 2^6666298221 is an apocalyptic number.

It is an amenable number.

6666298221 is a deficient number, since it is larger than the sum of its proper divisors (3030135603).

6666298221 is a wasteful number, since it uses less digits than its factorization.

6666298221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202009051.

The product of its digits is 746496, while the sum is 48.

The square root of 6666298221 is about 81647.4018018945. The cubic root of 6666298221 is about 1882.0373850586.

The spelling of 6666298221 in words is "six billion, six hundred sixty-six million, two hundred ninety-eight thousand, two hundred twenty-one".