66019385 has 16 divisors (see below), whose sum is σ = 80954640. Its totient is φ = 51671040.

The previous prime is 66019351. The next prime is 66019403. The reversal of 66019385 is 58391066.

It can be written as a sum of positive squares in 8 ways, for example, as 37589161 + 28430224 = 6131^2 + 5332^2 .

It is not a de Polignac number, because 66019385 - 2¹⁴ = 66003001 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70601 + ... + 71529.

It is an arithmetic number, because the mean of its divisors is an integer number (5059665).

Almost surely, 2^66019385 is an apocalyptic number.

It is an amenable number.

66019385 is a deficient number, since it is larger than the sum of its proper divisors (14935255).

66019385 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (66019384) it forms an eRAP, since the sums of their prime factors are consecutive (1227 and 1228).

66019385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 66019385 is about 8125.2313813208. The cubic root of 66019385 is about 404.1635635619.

The spelling of 66019385 in words is "sixty-six million, nineteen thousand, three hundred eighty-five".