6646659 has 8 divisors (see below), whose sum is σ = 8885520. Its totient is φ = 4419456.

The previous prime is 6646657. The next prime is 6646663. The reversal of 6646659 is 9566466.

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

It is not a de Polignac number, because 6646659 - 2¹ = 6646657 is a prime.

6646659 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6646659.

It is not an unprimeable number, because it can be changed into a prime (6646657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1482 + ... + 3935.

It is an arithmetic number, because the mean of its divisors is an integer number (1110690).

Almost surely, 2^6646659 is an apocalyptic number.

6646659 is a deficient number, since it is larger than the sum of its proper divisors (2238861).

6646659 is a wasteful number, since it uses less digits than its factorization.

6646659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5829.

The product of its digits is 233280, while the sum is 42.

The square root of 6646659 is about 2578.1115181466. Note that the first 3 decimals coincide. The cubic root of 6646659 is about 188.0187377581.

The spelling of 6646659 in words is "six million, six hundred forty-six thousand, six hundred fifty-nine".