66911 has 4 divisors (see below), whose sum is σ = 72072. Its totient is φ = 61752.

The previous prime is 66889. The next prime is 66919. The reversal of 66911 is 11966.

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 66911 - 2¹⁴ = 50527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561 + ... + 2586.

It is an arithmetic number, because the mean of its divisors is an integer number (18018).

2⁶⁶⁹¹¹ is an apocalyptic number.

66911 is a deficient number, since it is larger than the sum of its proper divisors (5161).

66911 is a wasteful number, since it uses less digits than its factorization.

66911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5160.

The product of its digits is 324, while the sum is 23.

The square root of 66911 is about 258.6716064820. The cubic root of 66911 is about 40.5974890663.

Subtracting from 66911 its reverse (11966), we obtain a palindrome (54945).

The spelling of 66911 in words is "sixty-six thousand, nine hundred eleven".