666263 has 8 divisors (see below), whose sum is σ = 731808. Its totient is φ = 602784.

The previous prime is 666233. The next prime is 666269. The reversal of 666263 is 362666.

666263 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 666263 - 2¹⁰ = 665239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206 + ... + 1172.

It is an arithmetic number, because the mean of its divisors is an integer number (91476).

2⁶⁶⁶²⁶³ is an apocalyptic number.

666263 is a deficient number, since it is larger than the sum of its proper divisors (65545).

666263 is a wasteful number, since it uses less digits than its factorization.

666263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1033.

The product of its digits is 7776, while the sum is 29.

The square root of 666263 is about 816.2493491575. The cubic root of 666263 is about 87.3404111480.

It can be divided in two parts, 666 and 263, that added together give a palindrome (929).

The spelling of 666263 in words is "six hundred sixty-six thousand, two hundred sixty-three".