6667447665 has 16 divisors (see below), whose sum is σ = 10767619008. Its totient is φ = 3522737856.

The previous prime is 6667447649. The next prime is 6667447691. The reversal of 6667447665 is 5667447666.

It is not a de Polignac number, because 6667447665 - 2⁴ = 6667447649 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2075482 + ... + 2078691.

It is an arithmetic number, because the mean of its divisors is an integer number (672976188).

Almost surely, 2^6667447665 is an apocalyptic number.

It is an amenable number.

6667447665 is a deficient number, since it is larger than the sum of its proper divisors (4100171343).

6667447665 is a wasteful number, since it uses less digits than its factorization.

6667447665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4154288.

The product of its digits is 30481920, while the sum is 57.

The square root of 6667447665 is about 81654.4405712267. The cubic root of 6667447665 is about 1882.1455496493.

Subtracting from 6667447665 its reverse (5667447666), we obtain a palindrome (999999999).

The spelling of 6667447665 in words is "six billion, six hundred sixty-seven million, four hundred forty-seven thousand, six hundred sixty-five".