6768661 has 2 divisors, whose sum is σ = 6768662. Its totient is φ = 6768660.

The previous prime is 6768659. The next prime is 6768667. The reversal of 6768661 is 1668676.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6682225 + 86436 = 2585^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 6768661 - 2¹ = 6768659 is a prime.

Together with 6768659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6768667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3384330 + 3384331.

It is an arithmetic number, because the mean of its divisors is an integer number (3384331).

Almost surely, 2^6768661 is an apocalyptic number.

6768661 is the 1164-th centered decagonal number.

It is an amenable number.

6768661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6768661 is an equidigital number, since it uses as much as digits as its factorization.

6768661 is an evil number, because the sum of its binary digits is even.

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

The square root of 6768661 is about 2601.6650437749. The cubic root of 6768661 is about 189.1621556580.

The spelling of 6768661 in words is "six million, seven hundred sixty-eight thousand, six hundred sixty-one".