663305 has 4 divisors (see below), whose sum is σ = 795972. Its totient is φ = 530640.

The previous prime is 663301. The next prime is 663319. The reversal of 663305 is 503366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 524176 = 373^2 + 724^2 .

It is not a de Polignac number, because 663305 - 2² = 663301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66326 + ... + 66335.

It is an arithmetic number, because the mean of its divisors is an integer number (198993).

2⁶⁶³³⁰⁵ is an apocalyptic number.

It is an amenable number.

663305 is a deficient number, since it is larger than the sum of its proper divisors (132667).

663305 is a wasteful number, since it uses less digits than its factorization.

663305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132666.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 663305 is about 814.4353872469. The cubic root of 663305 is about 87.2109646594.

It can be divided in two parts, 66 and 3305, that multiplied together give a triangular number (218130 = T₆₆₀).

The spelling of 663305 in words is "six hundred sixty-three thousand, three hundred five".