66881011 has 4 divisors (see below), whose sum is σ = 66898000. Its totient is φ = 66864024.

The previous prime is 66880999. The next prime is 66881027. The reversal of 66881011 is 11018866.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11018866 = 2 ⋅5509433.

It is a cyclic number.

It is not a de Polignac number, because 66881011 - 2¹⁹ = 66356723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66881041) 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, 805 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (16724500).

Almost surely, 2^66881011 is an apocalyptic number.

66881011 is a deficient number, since it is larger than the sum of its proper divisors (16989).

66881011 is a wasteful number, since it uses less digits than its factorization.

66881011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16988.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 66881011 is about 8178.0811319037. The cubic root of 66881011 is about 405.9142299830.

Adding to 66881011 its reverse (11018866), we get a palindrome (77899877).

The spelling of 66881011 in words is "sixty-six million, eight hundred eighty-one thousand, eleven".