6666247447 has 8 divisors (see below), whose sum is σ = 6732662144. Its totient is φ = 6599865528.

The previous prime is 6666247403. The next prime is 6666247453. The reversal of 6666247447 is 7447426666.

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 6666247447 - 2⁷ = 6666247319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6666247394 and 6666247403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666247747) 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, 704248 + ... + 713650.

It is an arithmetic number, because the mean of its divisors is an integer number (841582768).

Almost surely, 2^6666247447 is an apocalyptic number.

6666247447 is a deficient number, since it is larger than the sum of its proper divisors (66414697).

6666247447 is a wasteful number, since it uses less digits than its factorization.

6666247447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16389.

The product of its digits is 8128512, while the sum is 52.

The square root of 6666247447 is about 81647.0908667296. The cubic root of 6666247447 is about 1882.0326068541.

The spelling of 6666247447 in words is "six billion, six hundred sixty-six million, two hundred forty-seven thousand, four hundred forty-seven".