663106 has 4 divisors (see below), whose sum is σ = 994662. Its totient is φ = 331552.

The previous prime is 663097. The next prime is 663127. The reversal of 663106 is 601366.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601366 = 2 ⋅300683.

It can be written as a sum of positive squares in only one way, i.e., 576081 + 87025 = 759^2 + 295^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

663106 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165775 + ... + 165778.

2⁶⁶³¹⁰⁶ is an apocalyptic number.

663106 is a deficient number, since it is larger than the sum of its proper divisors (331556).

663106 is a wasteful number, since it uses less digits than its factorization.

663106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331555.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 663106 is about 814.3132075559. The cubic root of 663106 is about 87.2022423181.

The spelling of 663106 in words is "six hundred sixty-three thousand, one hundred six".