66447271 has 12 divisors (see below), whose sum is σ = 77335776. Its totient is φ = 56851520.

The previous prime is 66447259. The next prime is 66447281. The reversal of 66447271 is 17274466.

It is a de Polignac number, because none of the positive numbers 2^k-66447271 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66447271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66447211) 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 11 ways as a sum of consecutive naturals, for example, 14095 + ... + 18208.

It is an arithmetic number, because the mean of its divisors is an integer number (6444648).

Almost surely, 2^66447271 is an apocalyptic number.

66447271 is a deficient number, since it is larger than the sum of its proper divisors (10888505).

66447271 is a wasteful number, since it uses less digits than its factorization.

66447271 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32342 (or 32331 counting only the distinct ones).

The product of its digits is 56448, while the sum is 37.

The square root of 66447271 is about 8151.5195515928. The cubic root of 66447271 is about 405.0348412845.

The spelling of 66447271 in words is "sixty-six million, four hundred forty-seven thousand, two hundred seventy-one".