6681345 has 16 divisors (see below), whose sum is σ = 11662272. Its totient is φ = 3239360.

The previous prime is 6681329. The next prime is 6681359. The reversal of 6681345 is 5431866.

It is not a de Polignac number, because 6681345 - 2⁴ = 6681329 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 20082 + ... + 20411.

It is an arithmetic number, because the mean of its divisors is an integer number (728892).

Almost surely, 2^6681345 is an apocalyptic number.

It is an amenable number.

6681345 is a deficient number, since it is larger than the sum of its proper divisors (4980927).

6681345 is a wasteful number, since it uses less digits than its factorization.

6681345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40512.

The product of its digits is 17280, while the sum is 33.

The square root of 6681345 is about 2584.8297816297. The cubic root of 6681345 is about 188.3452329304.

The spelling of 6681345 in words is "six million, six hundred eighty-one thousand, three hundred forty-five".