66500111 has 4 divisors (see below), whose sum is σ = 66871800. Its totient is φ = 66128424.

The previous prime is 66500101. The next prime is 66500123. The reversal of 66500111 is 11100566.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66500111 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 (66500101) 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, 185576 + ... + 185933.

It is an arithmetic number, because the mean of its divisors is an integer number (16717950).

Almost surely, 2^66500111 is an apocalyptic number.

66500111 is a deficient number, since it is larger than the sum of its proper divisors (371689).

66500111 is a wasteful number, since it uses less digits than its factorization.

66500111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371688.

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

The square root of 66500111 is about 8154.7600209939. The cubic root of 66500111 is about 405.1421763694.

Adding to 66500111 its reverse (11100566), we get a palindrome (77600677).

The spelling of 66500111 in words is "sixty-six million, five hundred thousand, one hundred eleven".