66078247 has 2 divisors, whose sum is σ = 66078248. Its totient is φ = 66078246.

The previous prime is 66078217. The next prime is 66078253. The reversal of 66078247 is 74287066.

66078247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66078247 - 2⁷ = 66078119 is a 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 (66078217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33039123 + 33039124.

It is an arithmetic number, because the mean of its divisors is an integer number (33039124).

Almost surely, 2^66078247 is an apocalyptic number.

66078247 is a deficient number, since it is larger than the sum of its proper divisors (1).

66078247 is an equidigital number, since it uses as much as digits as its factorization.

66078247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 66078247 is about 8128.8527480820. The cubic root of 66078247 is about 404.2836434896.

The spelling of 66078247 in words is "sixty-six million, seventy-eight thousand, two hundred forty-seven".