66475271671 has 4 divisors (see below), whose sum is σ = 69973970200. Its totient is φ = 62976573144.

The previous prime is 66475271659. The next prime is 66475271711. The reversal of 66475271671 is 17617257466.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66475271671 - 2⁷ = 66475271543 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 (66475271371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1749349236 + ... + 1749349273.

It is an arithmetic number, because the mean of its divisors is an integer number (17493492550).

Almost surely, 2^66475271671 is an apocalyptic number.

66475271671 is a deficient number, since it is larger than the sum of its proper divisors (3498698529).

66475271671 is a wasteful number, since it uses less digits than its factorization.

66475271671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3498698528.

The product of its digits is 2963520, while the sum is 52.

The spelling of 66475271671 in words is "sixty-six billion, four hundred seventy-five million, two hundred seventy-one thousand, six hundred seventy-one".