66005611 has 8 divisors (see below), whose sum is σ = 79872480. Its totient is φ = 53248128.

The previous prime is 66005609. The next prime is 66005623. The reversal of 66005611 is 11650066.

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 66005611 - 2¹ = 66005609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66005311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277216 + ... + 277453.

It is an arithmetic number, because the mean of its divisors is an integer number (9984060).

Almost surely, 2^66005611 is an apocalyptic number.

66005611 is a deficient number, since it is larger than the sum of its proper divisors (13866869).

66005611 is a wasteful number, since it uses less digits than its factorization.

66005611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554693.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 66005611 is about 8124.3837304746. The cubic root of 66005611 is about 404.1354539588.

Adding to 66005611 its reverse (11650066), we get a palindrome (77655677).

The spelling of 66005611 in words is "sixty-six million, five thousand, six hundred eleven".