66066605 has 12 divisors (see below), whose sum is σ = 87143196. Its totient is φ = 48048000.

The previous prime is 66066587. The next prime is 66066617. The reversal of 66066605 is 50666066.

66066605 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 2 ways, for example, as 41126569 + 24940036 = 6413^2 + 4994^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66066605 is a prime.

It is a Duffinian number.

It is a congruent 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 11 ways as a sum of consecutive naturals, for example, 53996 + ... + 55205.

It is an arithmetic number, because the mean of its divisors is an integer number (7261933).

Almost surely, 2^66066605 is an apocalyptic number.

It is an amenable number.

66066605 is a deficient number, since it is larger than the sum of its proper divisors (21076591).

66066605 is a wasteful number, since it uses less digits than its factorization.

66066605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109228 (or 109217 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 66066605 is about 8128.1366253281. The cubic root of 66066605 is about 404.2598991822.

The spelling of 66066605 in words is "sixty-six million, sixty-six thousand, six hundred five".