666666666666667 has 8 divisors (see below), whose sum is σ = 671920877408256. Its totient is φ = 661412531970792.

The previous prime is 666666666666647. The next prime is 666666666666719. The reversal of 666666666666667 is 766666666666666.

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 666666666666667 - 2²³ = 666666658278059 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (666666666666647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1344583 + ... + 36539584.

It is an arithmetic number, because the mean of its divisors is an integer number (83990109676032).

Almost surely, 2^{666666666666667} is an apocalyptic number.

666666666666667 is a deficient number, since it is larger than the sum of its proper divisors (5254210741589).

666666666666667 is a wasteful number, since it uses less digits than its factorization.

666666666666667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38022857.

The product of its digits is 548549148672, while the sum is 91.

Subtracting 666666666666667 from its reverse (766666666666666), we obtain a palindrome (99999999999999).

The spelling of 666666666666667 in words is "six hundred sixty-six trillion, six hundred sixty-six billion, six hundred sixty-six million, six hundred sixty-six thousand, six hundred sixty-seven".