6766681 has 4 divisors (see below), whose sum is σ = 6931764. Its totient is φ = 6601600.

The previous prime is 6766667. The next prime is 6766691. The reversal of 6766681 is 1866676.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2944656 + 3822025 = 1716^2 + 1955^2 .

It is a cyclic number.

It is not a de Polignac number, because 6766681 - 2⁹ = 6766169 is a prime.

It is a super-2 number, since 2×6766681² = 91575943511522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6766601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82480 + ... + 82561.

It is an arithmetic number, because the mean of its divisors is an integer number (1732941).

Almost surely, 2^6766681 is an apocalyptic number.

It is an amenable number.

6766681 is a deficient number, since it is larger than the sum of its proper divisors (165083).

6766681 is a wasteful number, since it uses less digits than its factorization.

6766681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165082.

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

The square root of 6766681 is about 2601.2844904008. The cubic root of 6766681 is about 189.1437089965.

It can be divided in two parts, 6766 and 681, that added together give a palindrome (7447).

The spelling of 6766681 in words is "six million, seven hundred sixty-six thousand, six hundred eighty-one".