666671111 has 16 divisors (see below), whose sum is σ = 709430400. Its totient is φ = 625363200.

The previous prime is 666671101. The next prime is 666671179. The reversal of 666671111 is 111176666.

666671111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 666671111 - 2¹⁴ = 666654727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666671101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 321185 + ... + 323253.

It is an arithmetic number, because the mean of its divisors is an integer number (44339400).

Almost surely, 2^666671111 is an apocalyptic number.

666671111 is a deficient number, since it is larger than the sum of its proper divisors (42759289).

666671111 is a wasteful number, since it uses less digits than its factorization.

666671111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2410.

The product of its digits is 9072, while the sum is 35.

The square root of 666671111 is about 25819.9750387176. The cubic root of 666671111 is about 873.5824059734.

It can be divided in two parts, 6666 and 71111, that added together give a palindrome (77777).

The spelling of 666671111 in words is "six hundred sixty-six million, six hundred seventy-one thousand, one hundred eleven".