666103 has 4 divisors (see below), whose sum is σ = 695088. Its totient is φ = 637120.

The previous prime is 666091. The next prime is 666109. The reversal of 666103 is 301666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301666 = 2 ⋅150833.

It is a cyclic number.

It is not a de Polignac number, because 666103 - 2⁹ = 665591 is a prime.

It is a Duffinian number.

666103 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14458 + ... + 14503.

It is an arithmetic number, because the mean of its divisors is an integer number (173772).

2⁶⁶⁶¹⁰³ is an apocalyptic number.

666103 is a deficient number, since it is larger than the sum of its proper divisors (28985).

666103 is a wasteful number, since it uses less digits than its factorization.

666103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28984.

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

The square root of 666103 is about 816.1513340061. The cubic root of 666103 is about 87.3334191221. Note that the first 3 decimals are identical.

Adding to 666103 its reverse (301666), we get a palindrome (967769).

The spelling of 666103 in words is "six hundred sixty-six thousand, one hundred three".