66204805 has 8 divisors (see below), whose sum is σ = 79850232. Its totient is φ = 52694208.

The previous prime is 66204799. The next prime is 66204823. The reversal of 66204805 is 50840266.

66204805 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 25462116 + 40742689 = 5046^2 + 6383^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66204805 - 2⁵ = 66204773 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 7 ways as a sum of consecutive naturals, for example, 32622 + ... + 34591.

It is an arithmetic number, because the mean of its divisors is an integer number (9981279).

Almost surely, 2^66204805 is an apocalyptic number.

It is an amenable number.

66204805 is a deficient number, since it is larger than the sum of its proper divisors (13645427).

66204805 is a wasteful number, since it uses less digits than its factorization.

66204805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67415.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 66204805 is about 8136.6335176165. The cubic root of 66204805 is about 404.5415836396.

The spelling of 66204805 in words is "sixty-six million, two hundred four thousand, eight hundred five".