6665811 has 8 divisors (see below), whose sum is σ = 8908800. Its totient is φ = 4433352.

The previous prime is 6665803. The next prime is 6665831. The reversal of 6665811 is 1185666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6665811 - 2³ = 6665803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6665801) 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 7 ways as a sum of consecutive naturals, for example, 1011 + ... + 3788.

It is an arithmetic number, because the mean of its divisors is an integer number (1113600).

Almost surely, 2^6665811 is an apocalyptic number.

6665811 is a deficient number, since it is larger than the sum of its proper divisors (2242989).

6665811 is a wasteful number, since it uses less digits than its factorization.

6665811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5265.

The product of its digits is 8640, while the sum is 33.

The square root of 6665811 is about 2581.8231930169. The cubic root of 6665811 is about 188.1991533001.

The spelling of 6665811 in words is "six million, six hundred sixty-five thousand, eight hundred eleven".