1866666686867 has 2 divisors, whose sum is σ = 1866666686868. Its totient is φ = 1866666686866.

The previous prime is 1866666686779. The next prime is 1866666686891. The reversal of 1866666686867 is 7686866666681.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1866666686867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1866666686791 and 1866666686800.

It is not a weakly prime, because it can be changed into another prime (1866666686897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933333343433 + 933333343434.

It is an arithmetic number, because the mean of its divisors is an integer number (933333343434).

Almost surely, 2^{1866666686867} is an apocalyptic number.

1866666686867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1866666686867 is an equidigital number, since it uses as much as digits as its factorization.

1866666686867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6019743744, while the sum is 80.

The spelling of 1866666686867 in words is "one trillion, eight hundred sixty-six billion, six hundred sixty-six million, six hundred eighty-six thousand, eight hundred sixty-seven".