66448571 has 16 divisors (see below), whose sum is σ = 77096448. Its totient is φ = 56097600.

The previous prime is 66448561. The next prime is 66448579. The reversal of 66448571 is 17584466.

It is a cyclic number.

It is not a de Polignac number, because 66448571 - 2¹⁸ = 66186427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66448579) 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, 213506 + ... + 213816.

It is an arithmetic number, because the mean of its divisors is an integer number (4818528).

Almost surely, 2^66448571 is an apocalyptic number.

66448571 is a deficient number, since it is larger than the sum of its proper divisors (10647877).

66448571 is a wasteful number, since it uses less digits than its factorization.

66448571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 682.

The product of its digits is 161280, while the sum is 41.

The square root of 66448571 is about 8151.5992909367. The cubic root of 66448571 is about 405.0374826864.

The spelling of 66448571 in words is "sixty-six million, four hundred forty-eight thousand, five hundred seventy-one".