1666666867 has 2 divisors, whose sum is σ = 1666666868. Its totient is φ = 1666666866.

The previous prime is 1666666843. The next prime is 1666666873. The reversal of 1666666867 is 7686666661.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1666666867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1666666817) 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, 833333433 + 833333434.

It is an arithmetic number, because the mean of its divisors is an integer number (833333434).

Almost surely, 2^1666666867 is an apocalyptic number.

1666666867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1666666867 is an equidigital number, since it uses as much as digits as its factorization.

1666666867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15676416, while the sum is 58.

The square root of 1666666867 is about 40824.8314999585. The cubic root of 1666666867 is about 1185.6311490010.

The spelling of 1666666867 in words is "one billion, six hundred sixty-six million, six hundred sixty-six thousand, eight hundred sixty-seven".