665203481 has 2 divisors, whose sum is σ = 665203482. Its totient is φ = 665203480.

The previous prime is 665203439. The next prime is 665203529. The reversal of 665203481 is 184302566.

665203481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 484704256 + 180499225 = 22016^2 + 13435^2 .

It is a cyclic number.

It is not a de Polignac number, because 665203481 - 2¹⁴ = 665187097 is a prime.

It is a super-2 number, since 2×665203481² = 884991342269034722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (665203411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332601740 + 332601741.

It is an arithmetic number, because the mean of its divisors is an integer number (332601741).

Almost surely, 2^665203481 is an apocalyptic number.

It is an amenable number.

665203481 is a deficient number, since it is larger than the sum of its proper divisors (1).

665203481 is an equidigital number, since it uses as much as digits as its factorization.

665203481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 665203481 is about 25791.5389420639. The cubic root of 665203481 is about 872.9408913932.

The spelling of 665203481 in words is "six hundred sixty-five million, two hundred three thousand, four hundred eighty-one".