665047 has 2 divisors, whose sum is σ = 665048. Its totient is φ = 665046.

The previous prime is 665039. The next prime is 665051. The reversal of 665047 is 740566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665047 - 2³ = 665039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332523 + 332524.

It is an arithmetic number, because the mean of its divisors is an integer number (332524).

2⁶⁶⁵⁰⁴⁷ is an apocalyptic number.

665047 is a deficient number, since it is larger than the sum of its proper divisors (1).

665047 is an equidigital number, since it uses as much as digits as its factorization.

665047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 665047 is about 815.5041385548. The cubic root of 665047 is about 87.2872436462.

The spelling of 665047 in words is "six hundred sixty-five thousand, forty-seven".