666253 has 6 divisors (see below), whose sum is σ = 775086. Its totient is φ = 571032.

The previous prime is 666233. The next prime is 666269. The reversal of 666253 is 352666.

It can be written as a sum of positive squares in only one way, i.e., 432964 + 233289 = 658^2 + 483^2 .

It is not a de Polignac number, because 666253 - 2¹⁷ = 535181 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666203) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6750 + ... + 6847.

It is an arithmetic number, because the mean of its divisors is an integer number (129181).

2⁶⁶⁶²⁵³ is an apocalyptic number.

It is an amenable number.

666253 is a deficient number, since it is larger than the sum of its proper divisors (108833).

666253 is a wasteful number, since it uses less digits than its factorization.

666253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13611 (or 13604 counting only the distinct ones).

The product of its digits is 6480, while the sum is 28.

The square root of 666253 is about 816.2432235553. The cubic root of 666253 is about 87.3399741792.

It can be divided in two parts, 666 and 253, that added together give a palindrome (919).

The spelling of 666253 in words is "six hundred sixty-six thousand, two hundred fifty-three".