66605011 has 4 divisors (see below), whose sum is σ = 72660024. Its totient is φ = 60550000.

The previous prime is 66605009. The next prime is 66605027. The reversal of 66605011 is 11050666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66605011 - 2¹ = 66605009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66605311) 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 3 ways as a sum of consecutive naturals, for example, 3027490 + ... + 3027511.

It is an arithmetic number, because the mean of its divisors is an integer number (18165006).

Almost surely, 2^66605011 is an apocalyptic number.

66605011 is a deficient number, since it is larger than the sum of its proper divisors (6055013).

66605011 is a wasteful number, since it uses less digits than its factorization.

66605011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6055012.

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

The square root of 66605011 is about 8161.1893128392. The cubic root of 66605011 is about 405.3550937438.

Adding to 66605011 its reverse (11050666), we get a palindrome (77655677).

The spelling of 66605011 in words is "sixty-six million, six hundred five thousand, eleven".