7666667 has 2 divisors, whose sum is σ = 7666668. Its totient is φ = 7666666.

The previous prime is 7666661. The next prime is 7666669.

7666667 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 7666667 - 2¹⁶ = 7601131 is a prime.

Together with 7666669, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7666661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3833333 + 3833334.

It is an arithmetic number, because the mean of its divisors is an integer number (3833334).

Almost surely, 2^7666667 is an apocalyptic number.

7666667 is a deficient number, since it is larger than the sum of its proper divisors (1).

7666667 is an equidigital number, since it uses as much as digits as its factorization.

7666667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 381024, while the sum is 44.

The square root of 7666667 is about 2768.8746811656. The cubic root of 7666667 is about 197.1827261811.

The spelling of 7666667 in words is "seven million, six hundred sixty-six thousand, six hundred sixty-seven".