6661339 has 4 divisors (see below), whose sum is σ = 6669360. Its totient is φ = 6653320.

The previous prime is 6661337. The next prime is 6661349. The reversal of 6661339 is 9331666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9331666 = 2 ⋅4665833.

It is a cyclic number.

It is not a de Polignac number, because 6661339 - 2¹ = 6661337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661337) 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 3 ways as a sum of consecutive naturals, for example, 2599 + ... + 4480.

It is an arithmetic number, because the mean of its divisors is an integer number (1667340).

Almost surely, 2^6661339 is an apocalyptic number.

6661339 is a deficient number, since it is larger than the sum of its proper divisors (8021).

6661339 is an equidigital number, since it uses as much as digits as its factorization.

6661339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8020.

The product of its digits is 17496, while the sum is 34.

The square root of 6661339 is about 2580.9569930551. The cubic root of 6661339 is about 188.1570571522.

The spelling of 6661339 in words is "six million, six hundred sixty-one thousand, three hundred thirty-nine".