6666645 has 8 divisors (see below), whose sum is σ = 10666656. Its totient is φ = 3555536.

The previous prime is 6666617. The next prime is 6666679. The reversal of 6666645 is 5466666.

6666645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6666645 - 2⁵ = 6666613 is a prime.

It is a Curzon number.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 222207 + ... + 222236.

It is an arithmetic number, because the mean of its divisors is an integer number (1333332).

Almost surely, 2^6666645 is an apocalyptic number.

It is an amenable number.

6666645 is a deficient number, since it is larger than the sum of its proper divisors (4000011).

6666645 is a wasteful number, since it uses less digits than its factorization.

6666645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444451.

The product of its digits is 155520, while the sum is 39.

The square root of 6666645 is about 2581.9847017362. The cubic root of 6666645 is about 188.2070018848.

The spelling of 6666645 in words is "six million, six hundred sixty-six thousand, six hundred forty-five".