665994097 has 2 divisors, whose sum is σ = 665994098. Its totient is φ = 665994096.

The previous prime is 665994079. The next prime is 665994103. The reversal of 665994097 is 790499566.

665994097 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (665994079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572214241 + 93779856 = 23921^2 + 9684^2 .

It is a cyclic number.

It is not a de Polignac number, because 665994097 - 2¹¹ = 665992049 is a prime.

It is not a weakly prime, because it can be changed into another prime (665994997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332997048 + 332997049.

It is an arithmetic number, because the mean of its divisors is an integer number (332997049).

Almost surely, 2^665994097 is an apocalyptic number.

It is an amenable number.

665994097 is a deficient number, since it is larger than the sum of its proper divisors (1).

665994097 is an equidigital number, since it uses as much as digits as its factorization.

665994097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The square root of 665994097 is about 25806.8614325725. The cubic root of 665994097 is about 873.2865940289.

The spelling of 665994097 in words is "six hundred sixty-five million, nine hundred ninety-four thousand, ninety-seven".