66606111 has 48 divisors (see below), whose sum is σ = 116651520. Its totient is φ = 37234080.

The previous prime is 66606061. The next prime is 66606121. The reversal of 66606111 is 11160666.

It is not a de Polignac number, because 66606111 - 2⁶ = 66606047 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66606121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 49530 + ... + 50856.

It is an arithmetic number, because the mean of its divisors is an integer number (2430240).

Almost surely, 2^66606111 is an apocalyptic number.

66606111 is a deficient number, since it is larger than the sum of its proper divisors (50045409).

66606111 is a wasteful number, since it uses less digits than its factorization.

66606111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373 (or 1354 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 66606111 is about 8161.2567046993. The cubic root of 66606111 is about 405.3573252483.

Adding to 66606111 its reverse (11160666), we get a palindrome (77766777).

The spelling of 66606111 in words is "sixty-six million, six hundred six thousand, one hundred eleven".