66111841 has 4 divisors (see below), whose sum is σ = 66189312. Its totient is φ = 66034372.

The previous prime is 66111817. The next prime is 66111847. The reversal of 66111841 is 14811166.

66111841 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66111841 - 2¹⁷ = 65980769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66111847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37441 + ... + 39166.

It is an arithmetic number, because the mean of its divisors is an integer number (16547328).

Almost surely, 2^66111841 is an apocalyptic number.

It is an amenable number.

66111841 is a deficient number, since it is larger than the sum of its proper divisors (77471).

66111841 is an equidigital number, since it uses as much as digits as its factorization.

66111841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77470.

The product of its digits is 1152, while the sum is 28.

The square root of 66111841 is about 8130.9188287671. The cubic root of 66111841 is about 404.3521441151.

The spelling of 66111841 in words is "sixty-six million, one hundred eleven thousand, eight hundred forty-one".