78066259 has 2 divisors, whose sum is σ = 78066260. Its totient is φ = 78066258.

The previous prime is 78066257. The next prime is 78066311. The reversal of 78066259 is 95266087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78066259 - 2¹ = 78066257 is a prime.

Together with 78066257, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78066251) 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, 39033129 + 39033130.

It is an arithmetic number, because the mean of its divisors is an integer number (39033130).

Almost surely, 2^78066259 is an apocalyptic number.

78066259 is a deficient number, since it is larger than the sum of its proper divisors (1).

78066259 is an equidigital number, since it uses as much as digits as its factorization.

78066259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 78066259 is about 8835.5112472341. The cubic root of 78066259 is about 427.3868177282.

The spelling of 78066259 in words is "seventy-eight million, sixty-six thousand, two hundred fifty-nine".