666044123 has 2 divisors, whose sum is σ = 666044124. Its totient is φ = 666044122.

The previous prime is 666044087. The next prime is 666044153. The reversal of 666044123 is 321440666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666044123 - 2⁶ = 666044059 is a prime.

It is a super-2 number, since 2×666044123² = 887229547565678258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666044123.

It is not a weakly prime, because it can be changed into another prime (666044153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333022061 + 333022062.

It is an arithmetic number, because the mean of its divisors is an integer number (333022062).

Almost surely, 2^666044123 is an apocalyptic number.

666044123 is a deficient number, since it is larger than the sum of its proper divisors (1).

666044123 is an equidigital number, since it uses as much as digits as its factorization.

666044123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 666044123 is about 25807.8306527302. The cubic root of 666044123 is about 873.3084590582.

Adding to 666044123 its reverse (321440666), we get a palindrome (987484789).

The spelling of 666044123 in words is "six hundred sixty-six million, forty-four thousand, one hundred twenty-three".