66204745 has 4 divisors (see below), whose sum is σ = 79445700. Its totient is φ = 52963792.

The previous prime is 66204739. The next prime is 66204751. The reversal of 66204745 is 54740266.

66204745 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.

It is an interprime number because it is at equal distance from previous prime (66204739) and next prime (66204751).

It can be written as a sum of positive squares in 2 ways, for example, as 45738169 + 20466576 = 6763^2 + 4524^2 .

It is a cyclic number.

It is not a de Polignac number, because 66204745 - 2¹⁵ = 66171977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66204745.

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, 6620470 + ... + 6620479.

It is an arithmetic number, because the mean of its divisors is an integer number (19861425).

Almost surely, 2^66204745 is an apocalyptic number.

It is an amenable number.

66204745 is a deficient number, since it is larger than the sum of its proper divisors (13240955).

66204745 is a wasteful number, since it uses less digits than its factorization.

66204745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13240954.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 66204745 is about 8136.6298305871. The cubic root of 66204745 is about 404.5414614305.

The spelling of 66204745 in words is "sixty-six million, two hundred four thousand, seven hundred forty-five".