66005111 has 8 divisors (see below), whose sum is σ = 67217424. Its totient is φ = 64797120.

The previous prime is 66005099. The next prime is 66005113. The reversal of 66005111 is 11150066.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66005111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66005113) 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, 54731 + ... + 55923.

It is an arithmetic number, because the mean of its divisors is an integer number (8402178).

Almost surely, 2^66005111 is an apocalyptic number.

66005111 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

66005111 is a deficient number, since it is larger than the sum of its proper divisors (1212313).

66005111 is a wasteful number, since it uses less digits than its factorization.

66005111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 66005111 is about 8124.3529588516. The cubic root of 66005111 is about 404.1344334989.

Adding to 66005111 its reverse (11150066), we get a palindrome (77155177).

It can be divided in two parts, 6600 and 5111, that added together give a palindrome (11711).

The spelling of 66005111 in words is "sixty-six million, five thousand, one hundred eleven".