6659617 has 4 divisors (see below), whose sum is σ = 6664896. Its totient is φ = 6654340.

The previous prime is 6659591. The next prime is 6659623. The reversal of 6659617 is 7169566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 6659617 - 2¹⁵ = 6626849 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6659617.

It is not an unprimeable number, because it can be changed into a prime (6659677) 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 3 ways as a sum of consecutive naturals, for example, 492 + ... + 3682.

It is an arithmetic number, because the mean of its divisors is an integer number (1666224).

Almost surely, 2^6659617 is an apocalyptic number.

It is an amenable number.

6659617 is a deficient number, since it is larger than the sum of its proper divisors (5279).

6659617 is a wasteful number, since it uses less digits than its factorization.

6659617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278.

The product of its digits is 68040, while the sum is 40.

The square root of 6659617 is about 2580.6233743032. The cubic root of 6659617 is about 188.1408424755.

The spelling of 6659617 in words is "six million, six hundred fifty-nine thousand, six hundred seventeen".