66800099 has 2 divisors, whose sum is σ = 66800100. Its totient is φ = 66800098.

The previous prime is 66800093. The next prime is 66800131. The reversal of 66800099 is 99000866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66800099 - 2¹² = 66796003 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_3940697 and since 66800099 and 3940697 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (66800093) 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, 33400049 + 33400050.

It is an arithmetic number, because the mean of its divisors is an integer number (33400050).

Almost surely, 2^66800099 is an apocalyptic number.

66800099 is a deficient number, since it is larger than the sum of its proper divisors (1).

66800099 is an equidigital number, since it uses as much as digits as its factorization.

66800099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 66800099 is about 8173.1327531125. The cubic root of 66800099 is about 405.7504735589.

The spelling of 66800099 in words is "sixty-six million, eight hundred thousand, ninety-nine".