66986065 has 4 divisors (see below), whose sum is σ = 80383284. Its totient is φ = 53588848.

The previous prime is 66986057. The next prime is 66986081. The reversal of 66986065 is 56068966.

66986065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56068966 = 2 ⋅28034483.

It can be written as a sum of positive squares in 2 ways, for example, as 39538944 + 27447121 = 6288^2 + 5239^2 .

It is a cyclic number.

It is not a de Polignac number, because 66986065 - 2³ = 66986057 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 6698602 + ... + 6698611.

It is an arithmetic number, because the mean of its divisors is an integer number (20095821).

Almost surely, 2^66986065 is an apocalyptic number.

It is an amenable number.

66986065 is a deficient number, since it is larger than the sum of its proper divisors (13397219).

66986065 is a wasteful number, since it uses less digits than its factorization.

66986065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13397218.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 66986065 is about 8184.5015120043. The cubic root of 66986065 is about 406.1266500460.

The spelling of 66986065 in words is "sixty-six million, nine hundred eighty-six thousand, sixty-five".