66044191 has 8 divisors (see below), whose sum is σ = 66773504. Its totient is φ = 65318400.

The previous prime is 66044183. The next prime is 66044197. The reversal of 66044191 is 19144066.

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 66044191 - 2³ = 66044183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66044197) 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 7 ways as a sum of consecutive naturals, for example, 54391 + ... + 55591.

It is an arithmetic number, because the mean of its divisors is an integer number (8346688).

Almost surely, 2^66044191 is an apocalyptic number.

66044191 is a deficient number, since it is larger than the sum of its proper divisors (729313).

66044191 is a wasteful number, since it uses less digits than its factorization.

66044191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1761.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 66044191 is about 8126.7577175649. The cubic root of 66044191 is about 404.2141771099.

The spelling of 66044191 in words is "sixty-six million, forty-four thousand, one hundred ninety-one".