6786661 has 8 divisors (see below), whose sum is σ = 7850304. Its totient is φ = 5746560.

The previous prime is 6786649. The next prime is 6786673. The reversal of 6786661 is 1666876.

It is an interprime number because it is at equal distance from previous prime (6786649) and next prime (6786673).

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 6786661 - 2⁹ = 6786149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6786061) by changing a digit.

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, 5260 + ... + 6421.

It is an arithmetic number, because the mean of its divisors is an integer number (981288).

Almost surely, 2^6786661 is an apocalyptic number.

It is an amenable number.

6786661 is a deficient number, since it is larger than the sum of its proper divisors (1063643).

6786661 is a wasteful number, since it uses less digits than its factorization.

6786661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11771.

The product of its digits is 72576, while the sum is 40.

The square root of 6786661 is about 2605.1220700766. The cubic root of 6786661 is about 189.3296878086.

It can be divided in two parts, 6786 and 661, that added together give a palindrome (7447).

The spelling of 6786661 in words is "six million, seven hundred eighty-six thousand, six hundred sixty-one".