668123411 has 2 divisors, whose sum is σ = 668123412. Its totient is φ = 668123410.

The previous prime is 668123399. The next prime is 668123473. The reversal of 668123411 is 114321866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668123411 is a prime.

It is not a weakly prime, because it can be changed into another prime (668123111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334061705 + 334061706.

It is an arithmetic number, because the mean of its divisors is an integer number (334061706).

Almost surely, 2^668123411 is an apocalyptic number.

668123411 is a deficient number, since it is larger than the sum of its proper divisors (1).

668123411 is an equidigital number, since it uses as much as digits as its factorization.

668123411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 32.

The square root of 668123411 is about 25848.0833138552. The cubic root of 668123411 is about 874.2162935368.

The spelling of 668123411 in words is "six hundred sixty-eight million, one hundred twenty-three thousand, four hundred eleven".