66065965 has 24 divisors (see below), whose sum is σ = 94486392. Its totient is φ = 44190720.

The previous prime is 66065963. The next prime is 66065977. The reversal of 66065965 is 56956066.

66065965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9229444 + 56836521 = 3038^2 + 7539^2 .

It is not a de Polignac number, because 66065965 - 2¹ = 66065963 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66065963) 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 in 23 ways as a sum of consecutive naturals, for example, 6757 + ... + 13333.

It is an arithmetic number, because the mean of its divisors is an integer number (3936933).

Almost surely, 2^66065965 is an apocalyptic number.

It is an amenable number.

66065965 is a deficient number, since it is larger than the sum of its proper divisors (28420427).

66065965 is a wasteful number, since it uses less digits than its factorization.

66065965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6637 (or 6630 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 43.

The square root of 66065965 is about 8128.0972558158. The cubic root of 66065965 is about 404.2585937967.

The spelling of 66065965 in words is "sixty-six million, sixty-five thousand, nine hundred sixty-five".