663361 has 4 divisors (see below), whose sum is σ = 678832. Its totient is φ = 647892.

The previous prime is 663359. The next prime is 663371. The reversal of 663361 is 163366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 663361 - 2¹ = 663359 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, 7671 + ... + 7756.

It is an arithmetic number, because the mean of its divisors is an integer number (169708).

2⁶⁶³³⁶¹ is an apocalyptic number.

It is an amenable number.

663361 is a deficient number, since it is larger than the sum of its proper divisors (15471).

663361 is a wasteful number, since it uses less digits than its factorization.

663361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15470.

The product of its digits is 1944, while the sum is 25.

The square root of 663361 is about 814.4697661669. The cubic root of 663361 is about 87.2134188731.

It can be divided in two parts, 663 and 361, that added together give a 10-th power (1024 = 2¹⁰).

The spelling of 663361 in words is "six hundred sixty-three thousand, three hundred sixty-one".