6781667 has 2 divisors, whose sum is σ = 6781668. Its totient is φ = 6781666.

The previous prime is 6781661. The next prime is 6781699. The reversal of 6781667 is 7661876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6781667 - 2⁶ = 6781603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6781661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3390833 + 3390834.

It is an arithmetic number, because the mean of its divisors is an integer number (3390834).

Almost surely, 2^6781667 is an apocalyptic number.

6781667 is a deficient number, since it is larger than the sum of its proper divisors (1).

6781667 is an equidigital number, since it uses as much as digits as its factorization.

6781667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 6781667 is about 2604.1633973313. The cubic root of 6781667 is about 189.2832366659.

The spelling of 6781667 in words is "six million, seven hundred eighty-one thousand, six hundred sixty-seven".