666202123 has 4 divisors (see below), whose sum is σ = 689174640. Its totient is φ = 643229608.

The previous prime is 666202091. The next prime is 666202133. The reversal of 666202123 is 321202666.

It is a happy number.

666202123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666202123 - 2⁵ = 666202091 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666202091 and 666202100.

It is not an unprimeable number, because it can be changed into a prime (666202133) 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, 11486215 + ... + 11486272.

It is an arithmetic number, because the mean of its divisors is an integer number (172293660).

Almost surely, 2^666202123 is an apocalyptic number.

666202123 is a deficient number, since it is larger than the sum of its proper divisors (22972517).

666202123 is a wasteful number, since it uses less digits than its factorization.

666202123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22972516.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 666202123 is about 25810.8915576351. The cubic root of 666202123 is about 873.3775094521.

Adding to 666202123 its reverse (321202666), we get a palindrome (987404789).

The spelling of 666202123 in words is "six hundred sixty-six million, two hundred two thousand, one hundred twenty-three".