66940123 has 2 divisors, whose sum is σ = 66940124. Its totient is φ = 66940122.

The previous prime is 66940109. The next prime is 66940151. The reversal of 66940123 is 32104966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66940123 is a prime.

It is not a weakly prime, because it can be changed into another prime (66940103) 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, 33470061 + 33470062.

It is an arithmetic number, because the mean of its divisors is an integer number (33470062).

Almost surely, 2^66940123 is an apocalyptic number.

66940123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66940123 is an equidigital number, since it uses as much as digits as its factorization.

66940123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 66940123 is about 8181.6943844170. The cubic root of 66940123 is about 406.0337822845.

The spelling of 66940123 in words is "sixty-six million, nine hundred forty thousand, one hundred twenty-three".