66065685 has 32 divisors (see below), whose sum is σ = 122621952. Its totient is φ = 29747520.

The previous prime is 66065651. The next prime is 66065687. The reversal of 66065685 is 58656066.

It is not a de Polignac number, because 66065685 - 2⁹ = 66065173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66065687) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2340 + ... + 11730.

It is an arithmetic number, because the mean of its divisors is an integer number (3831936).

Almost surely, 2^66065685 is an apocalyptic number.

It is an amenable number.

66065685 is a deficient number, since it is larger than the sum of its proper divisors (56556267).

66065685 is a wasteful number, since it uses less digits than its factorization.

66065685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9473.

The product of its (nonzero) digits is 259200, while the sum is 42.

The square root of 66065685 is about 8128.0800315942. The cubic root of 66065685 is about 404.2580226879.

The spelling of 66065685 in words is "sixty-six million, sixty-five thousand, six hundred eighty-five".