66744448191 has 6 divisors (see below), whose sum is σ = 96408647400. Its totient is φ = 44496298788.

The previous prime is 66744448181. The next prime is 66744448217. The reversal of 66744448191 is 19184444766.

66744448191 is a `hidden beast` number, since 6 + 6 + 7 + 4 + 4 + 448 + 191 = 666.

It is not a de Polignac number, because 66744448191 - 2⁵ = 66744448159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66744448171) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3708024891 + ... + 3708024908.

It is an arithmetic number, because the mean of its divisors is an integer number (16068107900).

Almost surely, 2^66744448191 is an apocalyptic number.

66744448191 is a deficient number, since it is larger than the sum of its proper divisors (29664199209).

66744448191 is a wasteful number, since it uses less digits than its factorization.

66744448191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7416049805 (or 7416049802 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 54.

The spelling of 66744448191 in words is "sixty-six billion, seven hundred forty-four million, four hundred forty-eight thousand, one hundred ninety-one".