66186639441 has 96 divisors (see below), whose sum is σ = 111556739840. Its totient is φ = 37458796032.

The previous prime is 66186639413. The next prime is 66186639451. The reversal of 66186639441 is 14493668166.

66186639441 is a `hidden beast` number, since 6 + 61 + 86 + 63 + 9 + 441 = 666.

It is not a de Polignac number, because 66186639441 - 2¹⁰ = 66186638417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66186639451) 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 95 ways as a sum of consecutive naturals, for example, 62263476 + ... + 62264538.

Almost surely, 2^66186639441 is an apocalyptic number.

It is an amenable number.

66186639441 is a deficient number, since it is larger than the sum of its proper divisors (45370100399).

66186639441 is a wasteful number, since it uses less digits than its factorization.

66186639441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1895 (or 1892 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The spelling of 66186639441 in words is "sixty-six billion, one hundred eighty-six million, six hundred thirty-nine thousand, four hundred forty-one".