66008819 has 2 divisors, whose sum is σ = 66008820. Its totient is φ = 66008818.

The previous prime is 66008783. The next prime is 66008857. The reversal of 66008819 is 91880066.

It is an a-pointer prime, because the next prime (66008857) can be obtained adding 66008819 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66008819 - 2¹² = 66004723 is a prime.

It is a super-2 number, since 2×66008819² = 8714328371549522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66008879) 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, 33004409 + 33004410.

It is an arithmetic number, because the mean of its divisors is an integer number (33004410).

Almost surely, 2^66008819 is an apocalyptic number.

66008819 is a deficient number, since it is larger than the sum of its proper divisors (1).

66008819 is an equidigital number, since it uses as much as digits as its factorization.

66008819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 66008819 is about 8124.5811584352. The cubic root of 66008819 is about 404.1420011069.

The spelling of 66008819 in words is "sixty-six million, eight thousand, eight hundred nineteen".