66841847671 has 4 divisors (see below), whose sum is σ = 69146739000. Its totient is φ = 64536956344.

The previous prime is 66841847669. The next prime is 66841847687. The reversal of 66841847671 is 17674814866.

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 66841847671 - 2¹ = 66841847669 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66841847771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1152445621 + ... + 1152445678.

It is an arithmetic number, because the mean of its divisors is an integer number (17286684750).

Almost surely, 2^66841847671 is an apocalyptic number.

66841847671 is a deficient number, since it is larger than the sum of its proper divisors (2304891329).

66841847671 is a wasteful number, since it uses less digits than its factorization.

66841847671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304891328.

The product of its digits is 10838016, while the sum is 58.

The spelling of 66841847671 in words is "sixty-six billion, eight hundred forty-one million, eight hundred forty-seven thousand, six hundred seventy-one".