667169 has 4 divisors (see below), whose sum is σ = 668820. Its totient is φ = 665520.

The previous prime is 667141. The next prime is 667171. The reversal of 667169 is 961766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 238144 + 429025 = 488^2 + 655^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667169 is a prime.

It is a super-2 number, since 2×667169² = 890228949122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239 + ... + 1179.

It is an arithmetic number, because the mean of its divisors is an integer number (167205).

2⁶⁶⁷¹⁶⁹ is an apocalyptic number.

It is an amenable number.

667169 is a deficient number, since it is larger than the sum of its proper divisors (1651).

667169 is an equidigital number, since it uses as much as digits as its factorization.

667169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1650.

The product of its digits is 13608, while the sum is 35.

The square root of 667169 is about 816.8041380894. The cubic root of 667169 is about 87.3799823943.

The spelling of 667169 in words is "six hundred sixty-seven thousand, one hundred sixty-nine".