665799119 has 2 divisors, whose sum is σ = 665799120. Its totient is φ = 665799118.

The previous prime is 665799109. The next prime is 665799181. The reversal of 665799119 is 911997566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665799119 - 2⁴ = 665799103 is a prime.

It is a super-2 number, since 2×665799119² = 886576933722352322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665799109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332899559 + 332899560.

It is an arithmetic number, because the mean of its divisors is an integer number (332899560).

Almost surely, 2^665799119 is an apocalyptic number.

665799119 is a deficient number, since it is larger than the sum of its proper divisors (1).

665799119 is an equidigital number, since it uses as much as digits as its factorization.

665799119 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 53.

The square root of 665799119 is about 25803.0835172853. The cubic root of 665799119 is about 873.2013638978.

It can be divided in two parts, 665 and 799119, that multiplied together give a palindrome (531414135).

The spelling of 665799119 in words is "six hundred sixty-five million, seven hundred ninety-nine thousand, one hundred nineteen".