6466666647 has 16 divisors (see below), whose sum is σ = 9860099072. Its totient is φ = 3692939040.

The previous prime is 6466666631. The next prime is 6466666667. The reversal of 6466666647 is 7466666646.

It is not a de Polignac number, because 6466666647 - 2⁴ = 6466666631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6466666607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60943 + ... + 129024.

It is an arithmetic number, because the mean of its divisors is an integer number (616256192).

Almost surely, 2^6466666647 is an apocalyptic number.

6466666647 is a deficient number, since it is larger than the sum of its proper divisors (3393432425).

6466666647 is a wasteful number, since it uses less digits than its factorization.

6466666647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191598.

The product of its digits is 31352832, while the sum is 57.

The square root of 6466666647 is about 80415.5870898174. The cubic root of 6466666647 is about 1863.0599271543.

Subtracting 6466666647 from its reverse (7466666646), we obtain a palindrome (999999999).

The spelling of 6466666647 in words is "six billion, four hundred sixty-six million, six hundred sixty-six thousand, six hundred forty-seven".