6810661 has 16 divisors (see below), whose sum is σ = 8100288. Its totient is φ = 5644800.

The previous prime is 6810653. The next prime is 6810673. The reversal of 6810661 is 1660186.

It is a cyclic number.

It is not a de Polignac number, because 6810661 - 2³ = 6810653 is a prime.

It is a Duffinian number.

6810661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6810631) 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 15 ways as a sum of consecutive naturals, for example, 13626 + ... + 14116.

It is an arithmetic number, because the mean of its divisors is an integer number (506268).

Almost surely, 2^6810661 is an apocalyptic number.

It is an amenable number.

6810661 is a deficient number, since it is larger than the sum of its proper divisors (1289627).

6810661 is a wasteful number, since it uses less digits than its factorization.

6810661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 6810661 is about 2609.7243149421. The cubic root of 6810661 is about 189.5526038454.

The spelling of 6810661 in words is "six million, eight hundred ten thousand, six hundred sixty-one".