665403493 has 2 divisors, whose sum is σ = 665403494. Its totient is φ = 665403492.

The previous prime is 665403469. The next prime is 665403527. The reversal of 665403493 is 394304566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 349203969 + 316199524 = 18687^2 + 17782^2 .

It is a cyclic number.

It is not a de Polignac number, because 665403493 - 2⁵ = 665403461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665400493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332701746 + 332701747.

It is an arithmetic number, because the mean of its divisors is an integer number (332701747).

Almost surely, 2^665403493 is an apocalyptic number.

It is an amenable number.

665403493 is a deficient number, since it is larger than the sum of its proper divisors (1).

665403493 is an equidigital number, since it uses as much as digits as its factorization.

665403493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 40.

The square root of 665403493 is about 25795.4161238000. The cubic root of 665403493 is about 873.0283739767.

The spelling of 665403493 in words is "six hundred sixty-five million, four hundred three thousand, four hundred ninety-three".