66911041 has 4 divisors (see below), whose sum is σ = 66932932. Its totient is φ = 66889152.

The previous prime is 66911021. The next prime is 66911087. The reversal of 66911041 is 14011966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14011966 = 2 ⋅7005983.

It can be written as a sum of positive squares in 2 ways, for example, as 9090225 + 57820816 = 3015^2 + 7604^2 .

It is a cyclic number.

It is not a de Polignac number, because 66911041 - 2¹¹ = 66908993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66911021) 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, 5436 + ... + 12781.

It is an arithmetic number, because the mean of its divisors is an integer number (16733233).

Almost surely, 2^66911041 is an apocalyptic number.

It is an amenable number.

66911041 is a deficient number, since it is larger than the sum of its proper divisors (21891).

66911041 is a wasteful number, since it uses less digits than its factorization.

66911041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21890.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 66911041 is about 8179.9169311186. The cubic root of 66911041 is about 405.9749735842.

The spelling of 66911041 in words is "sixty-six million, nine hundred eleven thousand, forty-one".