66128123 has 2 divisors, whose sum is σ = 66128124. Its totient is φ = 66128122.

The previous prime is 66128099. The next prime is 66128143. The reversal of 66128123 is 32182166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66128123 - 2²⁴ = 49350907 is a prime.

It is not a weakly prime, because it can be changed into another prime (66128143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33064061 + 33064062.

It is an arithmetic number, because the mean of its divisors is an integer number (33064062).

Almost surely, 2^66128123 is an apocalyptic number.

66128123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66128123 is an equidigital number, since it uses as much as digits as its factorization.

66128123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 29.

The square root of 66128123 is about 8131.9200069848. The cubic root of 66128123 is about 404.3853359565.

The spelling of 66128123 in words is "sixty-six million, one hundred twenty-eight thousand, one hundred twenty-three".