66746723 has 2 divisors, whose sum is σ = 66746724. Its totient is φ = 66746722.

The previous prime is 66746717. The next prime is 66746731. The reversal of 66746723 is 32764766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66746723 - 2²⁰ = 65698147 is a prime.

It is equal to p_3937739 and since 66746723 and 3937739 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 (66746423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33373361 + 33373362.

It is an arithmetic number, because the mean of its divisors is an integer number (33373362).

Almost surely, 2^66746723 is an apocalyptic number.

66746723 is a deficient number, since it is larger than the sum of its proper divisors (1).

66746723 is an equidigital number, since it uses as much as digits as its factorization.

66746723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 41.

The square root of 66746723 is about 8169.8667675795. The cubic root of 66746723 is about 405.6423743768.

The spelling of 66746723 in words is "sixty-six million, seven hundred forty-six thousand, seven hundred twenty-three".