6645685 has 8 divisors (see below), whose sum is σ = 7994016. Its totient is φ = 5303760.

The previous prime is 6645679. The next prime is 6645697. The reversal of 6645685 is 5865466.

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

It is not a de Polignac number, because 6645685 - 2³ = 6645677 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1102 + ... + 3808.

It is an arithmetic number, because the mean of its divisors is an integer number (999252).

Almost surely, 2^6645685 is an apocalyptic number.

It is an amenable number.

6645685 is a deficient number, since it is larger than the sum of its proper divisors (1348331).

6645685 is a wasteful number, since it uses less digits than its factorization.

6645685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3203.

The product of its digits is 172800, while the sum is 40.

The square root of 6645685 is about 2577.9226132683. The cubic root of 6645685 is about 188.0095532342.

The spelling of 6645685 in words is "six million, six hundred forty-five thousand, six hundred eighty-five".