667224169 has 2 divisors, whose sum is σ = 667224170. Its totient is φ = 667224168.

The previous prime is 667224157. The next prime is 667224179. The reversal of 667224169 is 961422766.

It is a happy number.

667224169 is nontrivially palindromic in base 3.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 650862144 + 16362025 = 25512^2 + 4045^2 .

It is a cyclic number.

It is not a de Polignac number, because 667224169 - 2⁵ = 667224137 is a prime.

It is a super-2 number, since 2×667224169² = 890376183395481122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667224149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333612084 + 333612085.

It is an arithmetic number, because the mean of its divisors is an integer number (333612085).

Almost surely, 2^667224169 is an apocalyptic number.

It is an amenable number.

667224169 is a deficient number, since it is larger than the sum of its proper divisors (1).

667224169 is an equidigital number, since it uses as much as digits as its factorization.

667224169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 667224169 is about 25830.6827048764. The cubic root of 667224169 is about 873.8239084624.

The spelling of 667224169 in words is "six hundred sixty-seven million, two hundred twenty-four thousand, one hundred sixty-nine".