666310123 has 2 divisors, whose sum is σ = 666310124. Its totient is φ = 666310122.

The previous prime is 666310093. The next prime is 666310181. The reversal of 666310123 is 321013666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666310123 - 2⁵ = 666310091 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666310091 and 666310100.

It is not a weakly prime, because it can be changed into another prime (666311123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333155061 + 333155062.

It is an arithmetic number, because the mean of its divisors is an integer number (333155062).

Almost surely, 2^666310123 is an apocalyptic number.

666310123 is a deficient number, since it is larger than the sum of its proper divisors (1).

666310123 is an equidigital number, since it uses as much as digits as its factorization.

666310123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 666310123 is about 25812.9836129030. The cubic root of 666310123 is about 873.4247021739.

Adding to 666310123 its reverse (321013666), we get a palindrome (987323789).

The spelling of 666310123 in words is "six hundred sixty-six million, three hundred ten thousand, one hundred twenty-three".