665516011 has 2 divisors, whose sum is σ = 665516012. Its totient is φ = 665516010.

The previous prime is 665516009. The next prime is 665516023. The reversal of 665516011 is 110615566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665516011 - 2¹ = 665516009 is a prime.

Together with 665516009, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665586011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332758005 + 332758006.

It is an arithmetic number, because the mean of its divisors is an integer number (332758006).

Almost surely, 2^665516011 is an apocalyptic number.

665516011 is a deficient number, since it is larger than the sum of its proper divisors (1).

665516011 is an equidigital number, since it uses as much as digits as its factorization.

665516011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 665516011 is about 25797.5970004960. The cubic root of 665516011 is about 873.0775801457.

The spelling of 665516011 in words is "six hundred sixty-five million, five hundred sixteen thousand, eleven".