66844111 has 2 divisors, whose sum is σ = 66844112. Its totient is φ = 66844110.

The previous prime is 66844103. The next prime is 66844139. The reversal of 66844111 is 11144866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66844111 - 2³ = 66844103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66844171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33422055 + 33422056.

It is an arithmetic number, because the mean of its divisors is an integer number (33422056).

Almost surely, 2^66844111 is an apocalyptic number.

66844111 is a deficient number, since it is larger than the sum of its proper divisors (1).

66844111 is an equidigital number, since it uses as much as digits as its factorization.

66844111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 31.

The square root of 66844111 is about 8175.8247901970. The cubic root of 66844111 is about 405.8395650901.

Adding to 66844111 its reverse (11144866), we get a palindrome (77988977).

The spelling of 66844111 in words is "sixty-six million, eight hundred forty-four thousand, one hundred eleven".