66723071 has 2 divisors, whose sum is σ = 66723072. Its totient is φ = 66723070.

The previous prime is 66723061. The next prime is 66723077. The reversal of 66723071 is 17032766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66723071 - 2¹⁴ = 66706687 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66723077) 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, 33361535 + 33361536.

It is an arithmetic number, because the mean of its divisors is an integer number (33361536).

Almost surely, 2^66723071 is an apocalyptic number.

66723071 is a deficient number, since it is larger than the sum of its proper divisors (1).

66723071 is an equidigital number, since it uses as much as digits as its factorization.

66723071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 66723071 is about 8168.4191248980. The cubic root of 66723071 is about 405.5944549859.

The spelling of 66723071 in words is "sixty-six million, seven hundred twenty-three thousand, seventy-one".