66844113 has 16 divisors (see below), whose sum is σ = 102001536. Its totient is φ = 38142720.

The previous prime is 66844111. The next prime is 66844139. The reversal of 66844113 is 31144866.

It is not a de Polignac number, because 66844113 - 2¹ = 66844111 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66844111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16695 + ... + 20307.

It is an arithmetic number, because the mean of its divisors is an integer number (6375096).

Almost surely, 2^66844113 is an apocalyptic number.

It is an amenable number.

66844113 is a deficient number, since it is larger than the sum of its proper divisors (35157423).

66844113 is a wasteful number, since it uses less digits than its factorization.

66844113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4504.

The product of its digits is 13824, while the sum is 33.

The square root of 66844113 is about 8175.8249125088. The cubic root of 66844113 is about 405.8395691377.

Adding to 66844113 its reverse (31144866), we get a palindrome (97988979).

The spelling of 66844113 in words is "sixty-six million, eight hundred forty-four thousand, one hundred thirteen".