6650665 has 32 divisors (see below), whose sum is σ = 9803520. Its totient is φ = 4230144.

The previous prime is 6650659. The next prime is 6650671. The reversal of 6650665 is 5660566.

It is an interprime number because it is at equal distance from previous prime (6650659) and next prime (6650671).

It is a cyclic number.

It is not a de Polignac number, because 6650665 - 2⁹ = 6650153 is a prime.

6650665 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6650665.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 48477 + ... + 48613.

It is an arithmetic number, because the mean of its divisors is an integer number (306360).

Almost surely, 2^6650665 is an apocalyptic number.

It is an amenable number.

6650665 is a deficient number, since it is larger than the sum of its proper divisors (3152855).

6650665 is a wasteful number, since it uses less digits than its factorization.

6650665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 6650665 is about 2578.8883263918. Note that the first 3 decimals coincide. The cubic root of 6650665 is about 188.0565036890.

Subtracting from 6650665 its reverse (5660566), we obtain a palindrome (990099).

The spelling of 6650665 in words is "six million, six hundred fifty thousand, six hundred sixty-five".