663365 has 8 divisors (see below), whose sum is σ = 801528. Its totient is φ = 527040.

The previous prime is 663359. The next prime is 663371. The reversal of 663365 is 563366.

663365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (663359) and next prime (663371).

It can be written as a sum of positive squares in 4 ways, for example, as 58081 + 605284 = 241^2 + 778^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 663365 - 2⁴ = 663349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 663365.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539 + ... + 1271.

It is an arithmetic number, because the mean of its divisors is an integer number (100191).

2⁶⁶³³⁶⁵ is an apocalyptic number.

It is an amenable number.

663365 is a deficient number, since it is larger than the sum of its proper divisors (138163).

663365 is a wasteful number, since it uses less digits than its factorization.

663365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919.

The product of its digits is 9720, while the sum is 29.

The square root of 663365 is about 814.4722217485. The cubic root of 663365 is about 87.2135941688.

Subtracting from 663365 its reverse (563366), we obtain a palindrome (99999).

The spelling of 663365 in words is "six hundred sixty-three thousand, three hundred sixty-five".