1666666667 has 2 divisors, whose sum is σ = 1666666668. Its totient is φ = 1666666666.

The previous prime is 1666666649. The next prime is 1666666679. The reversal of 1666666667 is 7666666661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1666666667 - 2¹⁰ = 1666665643 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1666666637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833333333 + 833333334.

It is an arithmetic number, because the mean of its divisors is an integer number (833333334).

Almost surely, 2^1666666667 is an apocalyptic number.

1666666667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666666667 is an equidigital number, since it uses as much as digits as its factorization.

1666666667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11757312, while the sum is 56.

The square root of 1666666667 is about 40824.8290504688. The cubic root of 1666666667 is about 1185.6311015757.

The spelling of 1666666667 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-seven".