66442205 has 8 divisors (see below), whose sum is σ = 84420792. Its totient is φ = 50027008.

The previous prime is 66442199. The next prime is 66442217. The reversal of 66442205 is 50224466.

It can be written as a sum of positive squares in 4 ways, for example, as 29888089 + 36554116 = 5467^2 + 6046^2 .

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 66442205 - 2¹² = 66438109 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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390752 + ... + 390921.

It is an arithmetic number, because the mean of its divisors is an integer number (10552599).

Almost surely, 2^66442205 is an apocalyptic number.

It is an amenable number.

66442205 is a deficient number, since it is larger than the sum of its proper divisors (17978587).

66442205 is a wasteful number, since it uses less digits than its factorization.

66442205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781695.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 66442205 is about 8151.2088060606. The cubic root of 66442205 is about 405.0245476154.

The spelling of 66442205 in words is "sixty-six million, four hundred forty-two thousand, two hundred five".