66802147 has 2 divisors, whose sum is σ = 66802148. Its totient is φ = 66802146.

The previous prime is 66802121. The next prime is 66802187. The reversal of 66802147 is 74120866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66802147 - 2¹¹ = 66800099 is a prime.

It is not a weakly prime, because it can be changed into another prime (66802187) 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, 33401073 + 33401074.

It is an arithmetic number, because the mean of its divisors is an integer number (33401074).

Almost surely, 2^66802147 is an apocalyptic number.

66802147 is a deficient number, since it is larger than the sum of its proper divisors (1).

66802147 is an equidigital number, since it uses as much as digits as its factorization.

66802147 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66802147 is about 8173.2580407081. The cubic root of 66802147 is about 405.7546201020.

The spelling of 66802147 in words is "sixty-six million, eight hundred two thousand, one hundred forty-seven".