663066 has 20 divisors (see below), whose sum is σ = 1486122. Its totient is φ = 220968.

The previous prime is 663053. The next prime is 663071. The reversal of 663066 is 660366.

663066 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 77841 = 765^2 + 279^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1885 + ... + 2208.

2⁶⁶³⁰⁶⁶ is an apocalyptic number.

663066 is an abundant number, since it is smaller than the sum of its proper divisors (823056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663066 is a wasteful number, since it uses less digits than its factorization.

663066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4107 (or 4098 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 663066 is about 814.2886466113. The cubic root of 663066 is about 87.2004888731.

It can be divided in two parts, 6630 and 66, that multiplied together give a triangular number (437580 = T₉₃₅).

The spelling of 663066 in words is "six hundred sixty-three thousand, sixty-six".