66426719 has 2 divisors, whose sum is σ = 66426720. Its totient is φ = 66426718.

The previous prime is 66426709. The next prime is 66426739. The reversal of 66426719 is 91762466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66426719 - 2¹² = 66422623 is a prime.

It is a super-2 number, since 2×66426719² = 8825017994209922, which contains 22 as substring.

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 (66426709) 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, 33213359 + 33213360.

It is an arithmetic number, because the mean of its divisors is an integer number (33213360).

Almost surely, 2^66426719 is an apocalyptic number.

66426719 is a deficient number, since it is larger than the sum of its proper divisors (1).

66426719 is an equidigital number, since it uses as much as digits as its factorization.

66426719 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 66426719 is about 8150.2588302458. The cubic root of 66426719 is about 404.9930781726.

The spelling of 66426719 in words is "sixty-six million, four hundred twenty-six thousand, seven hundred nineteen".