663165 has 12 divisors (see below), whose sum is σ = 1149564. Its totient is φ = 353664.

The previous prime is 663163. The next prime is 663167. The reversal of 663165 is 561366.

It is an interprime number because it is at equal distance from previous prime (663163) and next prime (663167).

It can be written as a sum of positive squares in 2 ways, for example, as 412164 + 251001 = 642^2 + 501^2 .

It is not a de Polignac number, because 663165 - 2¹ = 663163 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7324 + ... + 7413.

It is an arithmetic number, because the mean of its divisors is an integer number (95797).

2⁶⁶³¹⁶⁵ is an apocalyptic number.

It is an amenable number.

663165 is a deficient number, since it is larger than the sum of its proper divisors (486399).

663165 is a wasteful number, since it uses less digits than its factorization.

663165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14748 (or 14745 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 663165 is about 814.3494335972. The cubic root of 663165 is about 87.2048285209.

It can be divided in two parts, 663 and 165, that added together give a palindrome (828).

The spelling of 663165 in words is "six hundred sixty-three thousand, one hundred sixty-five".