66844427 has 8 divisors (see below), whose sum is σ = 72122064. Its totient is φ = 61586208.

The previous prime is 66844409. The next prime is 66844439. The reversal of 66844427 is 72444866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66844427 - 2⁶ = 66844363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66844447) 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 7 ways as a sum of consecutive naturals, for example, 2753 + ... + 11885.

It is an arithmetic number, because the mean of its divisors is an integer number (9015258).

Almost surely, 2^66844427 is an apocalyptic number.

66844427 is a deficient number, since it is larger than the sum of its proper divisors (5277637).

66844427 is a wasteful number, since it uses less digits than its factorization.

66844427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9709.

The product of its digits is 258048, while the sum is 41.

The square root of 66844427 is about 8175.8441154415. The cubic root of 66844427 is about 405.8402046134.

It can be divided in two parts, 6684 and 4427, that added together give a palindrome (11111).

The spelling of 66844427 in words is "sixty-six million, eight hundred forty-four thousand, four hundred twenty-seven".