1666666666667 has 8 divisors (see below), whose sum is σ = 1668151248192. Its totient is φ = 1665182750400.

The previous prime is 1666666666661. The next prime is 1666666666669. The reversal of 1666666666667 is 7666666666661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1666666666667 - 2¹² = 1666666662571 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 1666666666594 and 1666666666603.

It is not an unprimeable number, because it can be changed into a prime (1666666666661) 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 in 7 ways as a sum of consecutive naturals, for example, 4915367 + ... + 5243487.

It is an arithmetic number, because the mean of its divisors is an integer number (208518906024).

Almost surely, 2^{1666666666667} is an apocalyptic number.

1666666666667 is a deficient number, since it is larger than the sum of its proper divisors (1484581525).

1666666666667 is a wasteful number, since it uses less digits than its factorization.

1666666666667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332629.

The product of its digits is 2539579392, while the sum is 74.

The spelling of 1666666666667 in words is "one trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-seven".