66708419 has 2 divisors, whose sum is σ = 66708420. Its totient is φ = 66708418.

The previous prime is 66708407. The next prime is 66708427. The reversal of 66708419 is 91480766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66708419 - 2⁴ = 66708403 is a prime.

It is a super-2 number, since 2×66708419² = 8900026330959122, which contains 22 as substring.

It is a Chen prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (66708479) 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, 33354209 + 33354210.

It is an arithmetic number, because the mean of its divisors is an integer number (33354210).

Almost surely, 2^66708419 is an apocalyptic number.

66708419 is a deficient number, since it is larger than the sum of its proper divisors (1).

66708419 is an equidigital number, since it uses as much as digits as its factorization.

66708419 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 66708419 is about 8167.5222068875. The cubic root of 66708419 is about 405.5647640813.

The spelling of 66708419 in words is "sixty-six million, seven hundred eight thousand, four hundred nineteen".