66871710893 has 24 divisors (see below), whose sum is σ = 76624237440. Its totient is φ = 58212073920.

The previous prime is 66871710839. The next prime is 66871710923. The reversal of 66871710893 is 39801717866.

It is not a de Polignac number, because 66871710893 - 2¹⁰ = 66871709869 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 (66871710593) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154823 + ... + 397131.

It is an arithmetic number, because the mean of its divisors is an integer number (3192676560).

Almost surely, 2^66871710893 is an apocalyptic number.

It is an amenable number.

66871710893 is a deficient number, since it is larger than the sum of its proper divisors (9752526547).

66871710893 is a wasteful number, since it uses less digits than its factorization.

66871710893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242429 (or 242416 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 56.

The spelling of 66871710893 in words is "sixty-six billion, eight hundred seventy-one million, seven hundred ten thousand, eight hundred ninety-three".