6691646 has 8 divisors (see below), whose sum is σ = 10809624. Its totient is φ = 3088440.

The previous prime is 6691637. The next prime is 6691661. The reversal of 6691646 is 6461966.

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

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 3 ways as a sum of consecutive naturals, for example, 128660 + ... + 128711.

It is an arithmetic number, because the mean of its divisors is an integer number (1351203).

Almost surely, 2^6691646 is an apocalyptic number.

6691646 is a deficient number, since it is larger than the sum of its proper divisors (4117978).

6691646 is a wasteful number, since it uses less digits than its factorization.

6691646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257386.

The product of its digits is 46656, while the sum is 38.

The square root of 6691646 is about 2586.8216018891. The cubic root of 6691646 is about 188.4419773245.

It can be divided in two parts, 6691 and 646, that added together give a palindrome (7337).

The spelling of 6691646 in words is "six million, six hundred ninety-one thousand, six hundred forty-six".