665867119 has 2 divisors, whose sum is σ = 665867120. Its totient is φ = 665867118.

The previous prime is 665867023. The next prime is 665867131. The reversal of 665867119 is 911768566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665867119 - 2¹¹ = 665865071 is a prime.

It is a super-2 number, since 2×665867119² = 886758040330720322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665867149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332933559 + 332933560.

It is an arithmetic number, because the mean of its divisors is an integer number (332933560).

Almost surely, 2^665867119 is an apocalyptic number.

665867119 is a deficient number, since it is larger than the sum of its proper divisors (1).

665867119 is an equidigital number, since it uses as much as digits as its factorization.

665867119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 49.

The square root of 665867119 is about 25804.4011556168. The cubic root of 665867119 is about 873.2310904172.

The spelling of 665867119 in words is "six hundred sixty-five million, eight hundred sixty-seven thousand, one hundred nineteen".