6668558123 has 2 divisors, whose sum is σ = 6668558124. Its totient is φ = 6668558122.

The previous prime is 6668558069. The next prime is 6668558161. The reversal of 6668558123 is 3218558666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6668558123 - 2⁸ = 6668557867 is a prime.

It is not a weakly prime, because it can be changed into another prime (6668552123) 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, 3334279061 + 3334279062.

It is an arithmetic number, because the mean of its divisors is an integer number (3334279062).

Almost surely, 2^6668558123 is an apocalyptic number.

6668558123 is a deficient number, since it is larger than the sum of its proper divisors (1).

6668558123 is an equidigital number, since it uses as much as digits as its factorization.

6668558123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2073600, while the sum is 50.

The square root of 6668558123 is about 81661.2400285472. The cubic root of 6668558123 is about 1882.2500337871.

The spelling of 6668558123 in words is "six billion, six hundred sixty-eight million, five hundred fifty-eight thousand, one hundred twenty-three".