667111 has 8 divisors (see below), whose sum is σ = 698544. Its totient is φ = 636480.

The previous prime is 667103. The next prime is 667123. The reversal of 667111 is 111766.

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 667111 - 2³ = 667103 is a prime.

It is a Duffinian number.

667111 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667141) 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, 2020 + ... + 2326.

It is an arithmetic number, because the mean of its divisors is an integer number (87318).

2⁶⁶⁷¹¹¹ is an apocalyptic number.

667111 is a deficient number, since it is larger than the sum of its proper divisors (31433).

667111 is a wasteful number, since it uses less digits than its factorization.

667111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its digits is 252, while the sum is 22.

The square root of 667111 is about 816.7686330902. The cubic root of 667111 is about 87.3774502094.

Adding to 667111 its reverse (111766), we get a palindrome (778877).

The spelling of 667111 in words is "six hundred sixty-seven thousand, one hundred eleven".