66336865 has 16 divisors (see below), whose sum is σ = 91163520. Its totient is φ = 45394560.

The previous prime is 66336859. The next prime is 66336871. The reversal of 66336865 is 56863366.

66336865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66336859) and next prime (66336871).

It is not a de Polignac number, because 66336865 - 2¹⁹ = 65812577 is a prime.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 18250 + ... + 21580.

It is an arithmetic number, because the mean of its divisors is an integer number (5697720).

Almost surely, 2^66336865 is an apocalyptic number.

It is an amenable number.

66336865 is a deficient number, since it is larger than the sum of its proper divisors (24826655).

66336865 is a wasteful number, since it uses less digits than its factorization.

66336865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3912.

The product of its digits is 466560, while the sum is 43.

The square root of 66336865 is about 8144.7446246030. The cubic root of 66336865 is about 404.8103872864.

The spelling of 66336865 in words is "sixty-six million, three hundred thirty-six thousand, eight hundred sixty-five".