6661345 has 8 divisors (see below), whose sum is σ = 8179776. Its totient is φ = 5204976.

The previous prime is 6661337. The next prime is 6661349. The reversal of 6661345 is 5431666.

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

It is a cyclic number.

It is not a de Polignac number, because 6661345 - 2³ = 6661337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6661349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15277 + ... + 15706.

It is an arithmetic number, because the mean of its divisors is an integer number (1022472).

Almost surely, 2^6661345 is an apocalyptic number.

It is an amenable number.

6661345 is a deficient number, since it is larger than the sum of its proper divisors (1518431).

6661345 is a wasteful number, since it uses less digits than its factorization.

6661345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31031.

The product of its digits is 12960, while the sum is 31.

The square root of 6661345 is about 2580.9581554144. The cubic root of 6661345 is about 188.1571136445.

The spelling of 6661345 in words is "six million, six hundred sixty-one thousand, three hundred forty-five".