66655123 has 2 divisors, whose sum is σ = 66655124. Its totient is φ = 66655122.

The previous prime is 66655091. The next prime is 66655129. The reversal of 66655123 is 32155666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66655123 - 2⁵ = 66655091 is a prime.

It is equal to p_3932647 and since 66655123 and 3932647 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66655129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33327561 + 33327562.

It is an arithmetic number, because the mean of its divisors is an integer number (33327562).

Almost surely, 2^66655123 is an apocalyptic number.

66655123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66655123 is an equidigital number, since it uses as much as digits as its factorization.

66655123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 66655123 is about 8164.2588763463. The cubic root of 66655123 is about 405.4567280498.

The spelling of 66655123 in words is "sixty-six million, six hundred fifty-five thousand, one hundred twenty-three".