66423719 has 2 divisors, whose sum is σ = 66423720. Its totient is φ = 66423718.

The previous prime is 66423689. The next prime is 66423739. The reversal of 66423719 is 91732466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66423719 - 2⁸ = 66423463 is a prime.

It is a super-2 number, since 2×66423719² = 8824220891581922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66423739) 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, 33211859 + 33211860.

It is an arithmetic number, because the mean of its divisors is an integer number (33211860).

Almost surely, 2^66423719 is an apocalyptic number.

66423719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66423719 is an equidigital number, since it uses as much as digits as its factorization.

66423719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 66423719 is about 8150.0747849330. The cubic root of 66423719 is about 404.9869812408.

The spelling of 66423719 in words is "sixty-six million, four hundred twenty-three thousand, seven hundred nineteen".